Portable

Accessibility
Balabolka Portable (Freeware) - read text aloud or save to audio file
Dicom Portable - word completion utility
Firefox Accessibility Extension - Make Firefox more accessible
On-Screen Keyboard Portable - Easily access an on-screen keyboard
Virtual Magnifying Glass Portable - A full-featured screen magnifier
Development 
AkelPad Portable - lightweight plaintext editor
Cppcheck Portable - C/C++ analysis tool
Database Browser Portable (Freeware) - Database management utility
DB Browser for SQLite Portable - Simple SQLite database management tool
Frhed Portable - free hex editor
Geany Portable - Text editor and basic IDE
gVim Portable - advanced, feature-rich text editor
HM NIS Edit Portable - NSIS development environment
IniTranslator Portable - INI translation tool
Notepad++ Portable - A full-featured text editor with syntax highlighting
Notepad2 Portable - Simple, lightweight text editor
Notepad2-mod Portable - Lightweight text editor
NSIS Portable - Windows installer and launcher creation
Nvu Portable & KompoZer Portable - The easy-to-use Nvu web editor
PortableApps.com Installer - the easy way to package portable apps
PortableApps.com Launcher - make apps portable without writing code
Sqliteman Portable - SQLite databases made easy
SWI-Prolog Portable - Prolog programming environment
Q-Eye Portable (Freeware) - lightweight QlikView data file viewer
XAMPP - Apache, mySQL, PHP, phpMyAdmin, etc in one package
Education
Artha Portable - offline thesaurus
BPBible Portable - bible study tool
Celestia Portable - portable space simulator
FreeMat Portable - scientific prototyping and technical computing
GoldenDict Portable - dictionary and encyclopedia lookups
Gramps Portable - genealogical research software
Marble Portable - virtual globe and atlas
Mnemosyne Portable - flashcard memorization tool
Solfege Portable - ear training program
Stellarium Portable - portable planetarium
TIPP10 Portable - touch typing tutor
TypeFaster Portable - touch typing tutor
Games
2048 Portable - number tile puzzle game
4st Attack Portable - 4-in-a-row puzzle game
Armagetron Advanced Portable - 3d lightcycle game
AssaultCube Portable - fast-paced, online, first-person shooter
Atomic Tanks Portable - overly-powerful tanks blow each other up
Battle for Wesnoth Portable - turn-based fantasy strategy game
Beret Portable - 2D puzzle-platformer game
Big Solitaires 3D Portable - collection of 40 solitaire games
Brutal Chess Portable - 3d chess
BYOND Portable (Freeware) - online multiplayer game creator
Canabalt Portable (Freeware) - outrun the demolition of your city with just one button
Chromium B.S.U. Portable - fast-paced, vertical scrolling space shooter
Cube Portable - old-school first person shooter
DOSBox Portable - classic DOS games to go
Freeciv Portable - empire-building strategy game
Frets on Fire Portable - rock out anywhere with this Guitar Hero™-style game
Get Sudoku Portable - interactive sudoku solver
Golly Portable - Game of Life simulator
Hedgewars Portable - turn-based strategy, artillery and comedy game
Hex-a-Hop Portable - hexagonal puzzle game
IceBreaker Portable - wall-building-style arcade game
I Have No Tomatoes Portable - run and explode maze game
Jooleem Portable - simple and addictive puzzle game with great music and visuals
Kobo Deluxe Portable - 3rd person scrolling 2D space shooter
LBreakout2 Portable - breakout-style arcade game similar to Arkanoid
LMarbles Portable - pattern-matching puzzle game
Lucas Chess Portable - chess trainer and player
Mana Plus Portable - a free, 2D, retro-style MMORPG
ManiaDrive Portable - acrobatic arcade race game
Mines-Perfect Portable - a classic hunt-for-mines game with advanced features
Monster 2 Portable - retro-style role-playing game
NetHack Portable - single player dungeon exploration
netPanzer Portable - multiplayer tactical warfare
Neverball Portable - 3d rolling ball obstacle course
OpenTTD Portable - urban planning simulation
Pathological Portable - color-matching puzzle game
Pingus Portable - puzzle platforming game
PokerTH Portable - classic Texas Hold Em style poker at its best
Project Invincible Portable - 3D chess with configurable AI
Pushover Portable - falling domino puzzle game
Puzzle Collection Portable - dozens of single player puzzles
Quick Blackjack Portable (Freeware) - play blackjack against the computer
Quick Bridge Portable (Freeware) - play bridge against the computer
Quick Cribbage Portable (Freeware) - play cribbage against the computer
Quick Poker Portable (Freeware) - play poker against the computer
Quick Solitaire Portable (Freeware) - seven classic solitaire games
Rocks'n'Diamonds Portable - fast-paced gem collection game
Sauerbraten (Cube 2) Portable - first person shooter
Scorched 3D Portable - turn-based over-powered artillery in 3D
Sudoku Portable - the wildly popular and addictive puzzle game
SuperTux Portable - jump n' run sidescroller game
SuperTuxKart Portable - multiplayer cart racing
T^3 Portable - 3 dimensional tetris
The Legend of Edgar Portable - 2D platform adventure game
The Powder Toy Portable - physics sandbox game
Tick5 Portable - 5-in-a-row puzzle game
Tile World Portable - engaging and fast-paced tile-based puzzles
Twin Distress Portable - color matching puzzle game
USB Sudoku Portable - the wildly popular and addictive puzzle game
Warzone 2100 Portable - single or online multiplayer real-time strategy game
WarMUX Portable - turn-based war of Unix mascots
WAtomic Portable - molecular puzzle game
WinBoard Chess Portable - advanced chess engine
X-Moto Portable - 2D motocross platform game
Xonotic Portable - fast-paced first person shooter
Zaz Portable - color-matching puzzle game
Graphics & Pictures
AndreaMosaic Portable (Freeware) - mosaic image creator
AniFX Portable (Freeware) - full-featured cursor editor
Blender Portable - 3D modelling, animation, rendering, post-production, playback
Caesium Portable - image converter and optimizer
Cornice Portable - image viewer with slideshow
Dia Portable - full-featured diagramming tool
DiffImg Portable - image comparison tool
Fotografix Portable (Freeware) - lightweight image editor
FotoSketcher Portable (Freeware) - make art from digital images
Fyre Portable - 2D computational artwork
GIMP Portable - Photo and Image Editor
Greenfish Icon Editor Pro Portable - icon, cursor, and library editor
Hot Spot Studio Portable (Freeware) - mix light to create art
IcoFX Portable (Freeware) - full-featured icon editor
Inkscape Portable - vector graphics editor
IrfanView Portable (Freeware) - lightweight graphic viewer
JPEGView Portable - image viewer and processor
K-3D Portable - 3D modeling and animation
LazPaint Portable - Photo and Image Editor
LibreCAD Portable - 2D computer-aided design (CAD) tool
Pencil Project Portable - prototyping and diagramming tool
PicPick Portable (Freeware) - screen capture, editor, color picker, and more
PhotoFiltre Portable (Freeware) - image editing and effects
PngOptimizer Portable - image converter and optimizer
RawTherapee Portable - advanced raw image processor
Smart Deblur Portable - sharpen out of focus and blurry images
XnView Portable (Freeware) - view, organize and convert photos
Internet 
aMSN Portable - chat and video chat on MSN/Windows Live
DamnVid Portable - video downloader and encoder
DownThemAll! Extension (for Firefox) - download the files and images you want faster
Ekiga Portable - softphone, video conferencing and chat
Feed Notifier Portable - RSS/ATOM popup feed notifications
FeedRoller Portable (Freeware) - RSS/ATOM desktop ticker
FileZilla Portable - the full-featured FTP client
Free Download Manager Portable - download manager and optimizer
Google Chrome Portable (Freeware) - fast, simple, themeable browser
gPodder Portable - podcast receiver and manager
Instantbird Portable - customizable instant messaging on AOL, Facebook, Google, MSN and more
Iron Portable - advanced web browser
Juice Portable - podcast receiver and manager
KiTTY Portable - telnet and SSH with added features
KVIrc Portable - full-featured IRC chat client
Links Portable - text-based browser
LAN Messenger Portable - peer-to-peer LAN chat and file transfer
Lynx Portable - text-based browser
Maxthon Portable (Freeware) - fast, powerful browser
MicroSIP Portable - lightweight SIP softphone
Miranda IM Portable - chat with AOL, MSN and Yahoo users in a customizable interface
Miranda NG Portable - multi-protocol instant messaging
Mozilla Firefox, Portable Edition - the award-winning web browser that's safe and secure
Mozilla Firefox Developer Edition, Portable - browser with built in development tools
Mozilla Thunderbird, Portable Edition - the handy email client
Nvu Portable & KompoZer Portable - the easy-to-use webpage editor
Opera, Portable Edition (Freeware) - lightweight, customizable browser
Opera Mail Portable (Freeware) - lightweight email client
PChat Portable - full-featured IRC chat client
Pidgin Portable - chat with AOL, MSN and Yahoo users in an easy-to-use interface
PopMan Portable - lightweight email notifier
Private Browsing by PortableApps.com - enhanced private browsing
PuTTY Portable - lightweight telnet and SSH client
qBittorrent Portable - lightweight bittorrent client
QuiteRSS Portable - Standalone RSS feed reader
QupZilla Portable - lightweight web browser
QuteCom Portable - softphone, text, audio and video chat
Sage Extension (for Firefox) - A full-featured RSS extension
SeaMonkey, Portable Edition - complete internet suite (browser, email, chat, newsgroups)
Skype Portable (Freeware) - instant messaging, video chat and phone calls
Transmission-Qt Portable - fast, easy, free bittorrent client
TweetDeck Portable (Freeware) - twitter client
µTorrent Portable (Freeware) - lightweight bittorrent client
WackGet Portable - simple download manager
WinSCP Portable - SFTP, FTP and SCP client
WinWGet Portable - take and manage your downloads on the go
wxDownload Fast Portable - multi-threaded download manager
Music & Video
AIMP Portable (freeware) - Music player, library, converter and more
Audacity Portable - A simple audio editor and recorder
CDEx Portable - cd audio extraction and conversion
cdrtfe Portable - CD, DVD, VCD burner
CoolPlayer+ Portable - Lightweight, fast, easy-to-use audio player
DVDStyler Portable - DVD menu authoring tool
fre:ac Portable - extract, convert, and encode audio
InfraRecorder Portable - full-featured CD and DVD burner
LMMS (Linux MultiMedia Studio) Portable - music creation and production
Media Player Classic - Home Cinema (MPC-HC) Portable - Lightweight media player
MediaInfo Portable - media information utility
Mp3splt-gtk Portable - mp3, FLAC, and ogg splitter
MuseScore Portable - music composition and notation
Paul Stretch Portable - extreme audio stretching
SMPlayer Portable - Full-featured movie player with support for most video formats
Songbird Portable - Full-featured digital media library and player
TAudioConverter Portable - audio converter and cd extractor
VirtualDub Portable - video processing and capture utility
VLC Media Player Portable - An easy to use media player that plays many formats
WaveShop Portable - bit-perfect audio editor
wxMP3gain Portable - MP3 audio normalizer
XMPlay Portable (Freeware) - Full featured audio player and library
Office 
A Note Portable - lightweight sticky notes
AbiWord Portable - a lightweight word processor compatible with Microsoft Word files
Apache OpenOffice Portable - word processor, spreadsheet, presentations with Microsoft compatibility
BabelPad Portable (Freeware) - Unicode word processor and text editor
CherryTree Portable - hierarchical note-taker and organizer
CintaNotes Portable (Freeware) - lightweight note-taker
Dia Portable - full-featured diagramming tool
Evince Portable - document viewer (pdf, ps, djvu, tiff, dvi)
Finance Explorer Portable (Freeware) - personal financial management
FocusWriter Portable - distraction-free word processor
Foxit Reader Portable (Freeware) - small and fast PDF reader
GnuCash Portable - accounting, expenses and financial management
Gnumeric Portable - full-featured spreadsheet
Jarte Portable (Freeware) - lightweight, tabbed word processor
KchmViewer Portable - full-featured CHM viewer
KeepNotePortable - note taking and organization
LibreOffice Portable - word processor, spreadsheet, presentations with excellent compatibility
Money Manager Ex Portable - easy-to-use personal finance software
Mozilla Sunbird, Portable Edition - Calendar and task management with a familiar interface
Mozilla Thunderbird, Portable Edition (Address Book) - Email client's full featured address book
PDFTK Builder Portable - split, collate, watermark and password protect PDF documents
PDF-XChange Viewer Portable (Freeware) - PDF viewer
PNotes Portable - sticky notes to go
RedNotebook Portable - modern journal and diary
Scribus Portable - desktop publishing
Sigil Portable - WYSIWYG ebook editor
SpeedCrunch Portable - an intuitive algebraic calculator
Stickies Portable (Freeware) - lightweight sticky notes
Sumatra PDF Portable - PDF, Comic Book, and E-book Reader
Task Coach Portable - to do list and task manager
The Guide Portable - two-pane outliner
WinDjView Portable - a lightweight DjVu viewer
ZoomIt Portable (Freeware) - live screen zooming and annotation
Security
ClamWin Portable - Antivirus on the go
Eraser Portable - securely delete files and data
EraserDrop Portable - easily secure-erase files and data
GPG Plugin Portable - GnuPG encrypt and sign utility
HijackThis Portable - Browser hijack scanner
Kaspersky TDSSKiller Portable (Freeware) - Rootkit remover
KeePass Password Safe Portable - Secure, easy-to-use password manager
McAfee Stinger Portable (Freeware) - Common antivirus and 'fake alert' remover
Password Gorilla Portable - Secure password manager
PeerBlock - firewall based on IP blacklists and whitelist
PWGen Portable - Secure password generator
Spybot - Search & Destroy Portable (Freeware) - Spyware detection and removal
Utilities
2X Client Portable (Freeware) - remote server and RDP access client
7-Zip Portable - File archiver and compressor
Ant Renamer Portable - Advanced file renaming utility
AquaSnap Portable (Freeware) - Screen productivity enhancement
Autoruns Portable (Freeware) - configure autorunning apps and more
BabelMap Portable (Freeware) - Unicode character browser
BleachBit Portable - cache, temp file and history cleaner
CamStudio Portable - screen recorder and video producer
Checksum Control Portable - create and verify MD5/SFV checksums
Clicky Gone Portable - easily hide running windows
Command Prompt Portable - Simple link to a customizable command prompt
Console Portable - console window enhancement
ControlPad Portable (Freeware) - Run commands and apps with your numeric keypad
Converber Portable (Freeware) - convert units of measurement
ConvertAll Portable - convert units of measurement
Cook Timer Portable - simple countdown timer
CPU-Z Portable (Freeware) - system profiler
CrystalDiskInfo Portable - disk health monitoring tool
CrystalDiskMark Portable - disk benchmark utility
CubicExplorer Portable - advanced file manager
Daphne Portable - process explorer, killer and debugger
DebugView Portable (Freeware) - system debug output monitor
Diffpdf Portable - compare PDFs textually and visually
Disk Cleaner Portable - cache, temp file and history cleaner
Ditto Portable - clipboard manager and extender
DM2 Portable - window control enhancer
Don't Panic! Portable - one-click application hider
dotNETInspector Portable - show which .NET frameworks are installed
DTaskManager Portable (Freeware) - advanced task manager
DSynchronize Portable (Freeware) - directory synchronization
Duplicate Files Finder Portable - find and remove duplicate files
DynDNS Simply Client Portable - update DynDNS hostname IP
Explorer++Portable - multi-tab file manager
FastCopy Portable - fast file copier and remover
FileAlyzer Portable (Freeware) - detailed file analysis
FontForge Portable - Outline font editor
FreeCommander Portable (Freeware) - easy-to-use windows file manager
FreeFileSync Portable - file and folder synchronization
Free UPX Portable (Freeware) - advanced executable compression
Ghostscript Portable - Postscript and PDF interpreter
GPU-Z Portable (Freeware) - graphics system profiler
grepWin Portable - regular expression search and replace
Gridy Portable - snap your open windows to a grid
HDHacker Portable (Freeware) - MBR and boot sector manager
HWiNFO Portable (Freeware) - software/hardware info
IObit Uninstaller Portable (Freeware) - uninstaller and cleaner
IObit Unlocker Portable (Freeware) - unlock undeleteable and unmovable files
JkDefrag Portable - Disk defragmentation and optimization
jPortable (Freeware) - Java virtual machine made portable
jPortable Browser Switch - Enable or disable jPortable's Java browser plugin
jPortable Launcher - Run Java JARs portably
Lightscreen Portable - easy to use screenshot tool
Listary Portable (Freeware) - find-as-you-type search for Windows Explorer and more
PeaZip Portable - Easy to use file archiver and compressor
PortableApps.com AppCompactor - shrink apps without affecting functionality
PortableApps.com Backup - integrated backup utility bundled with the platform
PortableApps.com Menu - integrated start menu bundled with the platform
Process Explorer Portable (Freeware) - task manager and process analyzer
Process Hacker Portable - advanced task manager
Process Monitor Portable (Freeware) - real-time file, registry and process monitor
Q-Dir Portable (Freeware) - quad pane file manager
QwikMark Portable (Freeware) - quick system benchmark
Rapid CRC Unicode Portable - CRC/MD5/SHA hashing
RBTray Portable - minimize apps to the system tray
RegAlyzer Portable - registry editor
Regshot Portable - registry and file comparison
Rufus Portable - format and create bootable USB drives
Revo Uninstaller Portable (Freeware) - easy to use uninstaller
Shortcuts Search And Replace Portable - Search and adjust shortcut paths
SIW (System Information for Windows) Portable (Freeware) - software/hardware info
Smart Defrag Portable (Freeware) - disk defragmentation and optimization
SnapTimer Portable (Freeware) - countdown timer
SpeedyFox Portable (Freeware) - speed up Firefox, Thunderbird and more
Synkron Portable - file and directory synchronization
System Explorer Portable (Freeware) - task manager and process analyzer
TeamViewer Portable (Freeware) - remote PC support and screen-sharing
Texter Portable - text substitution utility
TinyTask Portable - simple macro record/playback
Toucan - backup, sync and encrypt for advanced users
TreeSize Free Portable (Freeware) - disk usage analyzer and cleanup tool
TyperTask Portable (Freeware) - text substitution utility
UNetbootin Portable - create bootable Linux USB drives
UltraDefrag Portable - Disk defragmentation and optimization
UUID-GUID Generator Portable - generate unique identifiers
Virtual Volumes View Portable - drive and disk cataloger
VirtuaWin Portable - virtual desktop manager
WhatChanged Portable (Freeware) - registry and file change tracker
WhoDat Portable - WHOIS lookup client
WinDirStat Portable - disk usage analyzer and cleanup tool
Windows Error Lookup Tool Portable (Freeware) - find windows error code details
winMd5Sum Portable - check md5 sums to verify files on the go
WinPenguins Portable - penguins running around your desktop
WinMerge Portable - file comparison and merging
Wise Disk Cleaner Portable (Freeware) - disk cleaner and defragmenter
Wise Program Uninstaller Portable (Freeware) - local software uninstaller
Wise Registry Cleaner Portable (Freeware) - registry cleaner and optimizer
Wise Data Recovery Portable (Freeware) - data and file recovery
WinMTR Portable - network diagnostic tool
World Clock Portable (Freeware) - multiple time zone clock
Workrave Portable - repetitive stress injury prevention
Xenon File Manager Portable - portable file browser
XN Resource Editor Portable -lightweight binary resource editor
xpy Portable - system settings tweaker
Zint Barcode Studio Portable - barcode generator
ZSoft Uninstaller Portable (Freeware) - uninstaller and cleaner