I do Source Mapping but mostly for Portal and Portal 2. I'm the main mapper of Portal: Project-Beta, Blue Portals and I'm also a mapper for Portal: Alive and Kicking. I do mapping for other Source games such as Half-Life 2 also.
BPDC is the group behind the Portal mod titled "Blue Portals."
This group is about Portal: Project Beta dev team!
rHetoricAl is a small group behind many addons and maps and reskins for various games, mostly Source games.
For people and teams developing mods and games with Valve's Source engine.