Platform
Platform for PHP which has gambArt GUI framework for standalone desktop application development, Semok web application framework, and classes collection (distributed computing, networking, compression, byte compiler, SMS, XML, and database abstraction).
Developer: Reza Iqbal
License: Common Public License
Operating System: Linux, Windows
Online complete swapping platform allowing you to create your own online swapmeet web site in minutes.
Developer: iScripts
License: Open Software License
Operating System: Linux,Windows
Nuxeo Enterprise Platform (Nuxeo EP) is the underlying content management foundation behind the range of content applications offered by Nuxeo and the Nuxeo Galaxy Partner community.
Developer: Nuxeo
License: GNU Lesser General Public License (LGPL)
Operating System: Java EE-based platform
A small platform independent content managment system for non-transational websites (sites that just distribute information).
Developer: Matthew Craig
License: GNU General Public License (GPL)
Operating System: OS Independent (Written in an interpreted language)
ScummVM is a cross-platform interpreter for several point-and-click adventure engines.
Developer: scummvm.org
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), All POSIX (Linux/BSD/UNIX-like OSes), OS Portable (Source code to work with many OS platforms), PalmOS, Symbi
Hammer of Thyrion is a cross-platform port of Raven's Hexen II source.
Developer: uhexen2
License: GNU General Public License (GPL)
Operating System: MinGW/MSYS (MS Windows), 64-bit MS Windows, All 32-bit MS Windows (95/98/NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), All POSIX (Linux/BSD/UNIX-like OSes), QNX, FreeBSD, Lin
A cross-platform, OpenGL-rendered Duke Nukem 3D port which provides many new features for mod authors.
Developer: eduke32
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), OS Portable (Source code to work with many OS platforms)
A scrolling, platform-jumping, key-collecting, ancient pyramid exploring game, vaguely in the style of similar games for the Commodore+4.
Developer: abe
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (95/98), All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), Linux, OS X, BeOS
BALLOONS is a tile based platform puzzle game written in C++ using SDL.
Developer: balloons-ng
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes)
A cross platform Perl/Tk tetris clone where the board spins and zooms in and out on higher difficulty levels.
Developer: spewtris
License: GNU General Public License (GPL)
Operating System: Not Available
Jracers is a multi-platform compatible game that is fast.
Developer: RF
License: Freeware
Operating System: Unix/Linux/Windows
Give1Get2 is an online trading platform based on win-win-win strategy.
Developer: Yann Geffrotin
License: Freeware
Operating System: All
CPAINT (Cross-Platform Asynchronous INterface Toolkit) is a true AJAX (Asynchronous JavaScript+XML) and JSRS (JavaScript Remote Scripting) implementation that supports both PHP and ASP/VBscript.
Developer: Paul Sullivan, Dominique Stender
License: Freeware
Operating System: linux, windows, freebsd, osx, sun
phpWebsite is a multi-platform compatible founded and hosted by the Web Technology Group at Appalachian State University, is developed by the phpWebSite Development Team.
Developer: phpwebsite
License: Freeware
Operating System: All
WebGUI is a content management platform built to allow average business users to build and maintain complex web sites.
Developer: Plain Black Software
License: GNU General Public License (GPL)
Operating System: MacOS X, Windows NT/2000, OS Independent, Linux
Drupal is a multi-platform compatible content management system designed to hold personal projects such as web logs to large community sites.
Developer: tachi
License: Freeware
Operating System: Unix/Linux/Windows
TinyMCE is a platform independent web based Javascript HTML WYSIWYG editor control released as Open Source under LGPL by Moxiecode Systems AB.
Developer: TinyMCE
License: GNU Lesser General Public License (LGPL)
Operating System: Platform Independent
WebChess is a multi-platform compatible online chess game, WebChess allows two people to meet online and play.
Developer: webchess
License: Freeware
Operating System: All
Relax multi-platform compatible.
Developer: Matti Tukiainen
License: Freeware
Operating System: Unix/Linux/Windows
Ublog is a multi-platform compatible program that includes:Toolbar to add images, links,etc.
Developer: Francesco Formichella
License: Freeware
Operating System: Windows

More Info