Bioware - the creators of Baldur's Gate 2 and the Infinity Engine
Spellhold Studios - a large community hosting many IE mods
Pocket Plane - a large community hosting many IE mods
The Gibberlings Three - a large community hosting many IE mods
Black Wyrm's Lair- a large community hosting many IE mods
WeiDU - the ultimate modding tool for IE games
DLTCEP - an excellent editor for IE games
Near Infinity - an excellent editor for IE games
IESDP - an effort to research the workings of the IE
Infinity Explorer - a very useful browsing tool for IE games