Collision File Editor II, the successor of the popular CollEditor, is a tool for creating and editing collision files (*.col) for GTA III, Vice City and San Andreas.
Built completely from scratch, CollEditor II is much more reliable and flexible, and offers a lot more features than the old one. It fully supports all characteristics of all 3 known .col file formats, and offers several built-in optimization routines to achieve best possible results.
For more information, visit the official website: http://ce2.steve-m.com