
Antimicro is a graphical program used to assign keyboard keys and mouse controls to a gamepad. It’s useful for using a gamepad on PC games that do not have any form of built-in gamepad support. This program can also be used to control any desktop application with a gamepad. On Linux, this means that your system has to be running an X environment in order to run this program.
This program currently works with various Linux distributions, Windows (Vista and later), and FreeBSD, but with limited support for FreeBSD and Windows XP.

Game Downloader is a portable and open source download client, which interacts with a server side library for downloading numerous (freeware) games. With the help of this utility, you can download more than 200 games, by simply selecting a game category then selecting any game from the available list.

Immediately get started creating a high quality game then publish native executables for both Microsoft Windows and Mac OS X or upload straight to Steam Workshop with a resource limited free version of GameMaker: Studio. Steam shop has also started offering software rather than just games..

Mashape is an API marketplace where service providers and individual developers can instantly make available an API to their audience, with infrastructure and traction since day one, while third party developers can use/call through a single interface any software component listed in Mashape.

An italian online newspaper ‘La Repubblica’ offers 12 days of free downloads..
For non-italians click where it says scarica gratis
Music, apps, video, it kicks off with a foo fighter song.
A free and open source karaoke game inspired by the Singstar™ game available on the Playstation®. It allows up to six players to sing along with music using microphones in order to score points, depending on the pitch of the voice and the rhythm of singing.
Use any video filetype you want as background (youtube / flv, divx, mpg / mpeg, avi, ..). You can create and use your own songs, various are already available. Customize its look through themes and extend it with more party game modes via plug ins.
UltraStar Deluxe allows you to create and use your own songs, and does offer an easy way to manage your collection of songs. You can modify its look & feel through themes and skins and extend it with more game modes via plugins.
As far as i know linux and mac versions are in progress..

Native code for web apps.
Native Client is an open-source technology for running x86 native code in web applications, with the goal of maintaining the browser neutrality, OS portability, and safety that people expect from web apps.
Basically a plug-in (for browser) and sdk (for developers) to use the browser to run x86 native code.
Nice and crazy, isn’t it?