The Portable App Directory™ and Portable App Marketplace™ list free open source software and freewareportable apps. As always, the PortableApps.com Platform, menu, backup utility, launchers, installer, format and other utilities are open source.
Development
Development
AkelPad Portable - lightweight plaintext editor
Database Browser Portable (Freeware) - Database management utility-
Geany Portable - Text editor and basic IDE 
Notepad++ Portable - A full-featured text editor with syntax highlighting
Notepad2 Portable - Simple, lightweight text editor
NSIS Portable - Windows installer and launcher creation
SQLite Database Browser Portable - Simple SQLite database management tool
SWI-Prolog Portable - Prolog programming environment
XAMPP - Apache, mySQL, PHP, phpMyAdmin, etc in one package
