Serverside Anti-Cheat for the Source Engine.
An Open Source SteamUI replacement.
Manage your TeamFortress 2 items outside the game.
A clientside plugin for Day of Defeat : Source that makes records automatically.
A relay between orangebox's games and mIRC.
A server plugin for orangebox's games that displays your server score when requested.
Retrieve Valve's masterservers ip and port easily.
See the email associated with your steam account (it bypasses steamguard).
Reactivate the -tickrate commandline switch on CSS / DODS / TF2.
Tool that converts replay files into demo files.
Customize the steam notifications' position on a per game basis easily.
Replace the console of the source dedicated server with a more powerful one.
The first French multiuploading service. Stopped due to legal issues.
A bot that automatically reverses Steam's interfaces.
This project provides a various set of headers that allows to use the steamworks and internal steam features in your app. I'm not the owner of that project, but one of its developers.