need some links

i''m trying to find some existing FREE library distributions or information for these things: camera operations bezeirs and nurbs bounding and collision physics i have a good idea how to program these, but i really don''t want to reinvent all these things... probably what''s out there is better than anything i can program anyways... I''ve got some libraries that have camera, collision and bezeir functions in them, BUT they are very simple or if not, incompatible... Any pointers will be appreciated.. thanx in advance!