Another library that I enjoy working with is wXwindows. wX is a "cross platform" application framework and GUI class library. If I write a wX program, I can compile it under Borland C and have a Windows program, or compile it on GNU C on my Linux PC or SGI workstation and have a UNIX X Window program. There's even a Mac version of wX, but I currently lack the Mac and compiler to try it out. There are also commercial cross-platform libraries. A particularly interesting one (PowerPlant) comes with the Motorola CodeWarrior compiler (probably the most popular C compiler on the Mac). I believe that's the framework and compiler used for Poser. Although the nice folks at Motorola said that they are going to stop the cross-platform stuff this year.