There are 2 repositories under sly-cooper topic.
Decompilation of Sly Cooper and the Thievius Raccoonus for the PS2
Project to rebuild the sly series on to PC
The biggest Sly Cooper mod database
World editing tool for Sly 2: Band of Thieves
Real-time game state viewer for Sly 2 and Sly 3
Toolkit for making string replacement mods for Sly 2