I never used a collision engine before, but i would like to use a good one.
What i need is basic figures like squares, triangles and circles, but a bitmap with bit mask collision (or similar) too.

pmask is good

I think OpenLayers collision detection is pretty solid too. I've never used it myself, though, so I can't really say for sure.

pmask

You people use collision engines?
I've always written them myself. Though I've never finished a game, so...

hey guys im wondering is pmask a c++ lib or c?

c

PMASK is the best one for when it comes to bitmask-collisions. IIRC, Collegro also allows you to do collisions of geometric shapes, but that's C++ only.

AE.

Thx guys, i will try pmask.