When comparing Crystal Space 3D vs Pixel Vision 8, the Slant community recommends Pixel Vision 8 for most people. In the question“What are the best 100% free and easy game engines for beginners?” Pixel Vision 8 is ranked 28th while Crystal Space 3D is ranked 39th. The most important reason people chose Pixel Vision 8 is:
Although it started as a commercial product, it is now open-source.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Scripting language bindings (via swig) python, perl, tcl
Scripting language biddings are available via swig, supposedly any swig target could be used If you are okay with building, and probably maintaining, the project for your own needs then you may be able to build bindings for your favorite scripting platform.
As noted in a slant "con", there are no binary releases, including no prebuilt bindings.
Pro Cross platform
Runs on all major desktop platforms.
Pro Free and open-source
Although it started as a commercial product, it is now open-source.
Pro Most customizable
This is the first of its kind, being fully customizable. You can customize the game size, color pallete, sound and more.
Cons
Con No binary releases.
Expect to compile this from source if your want to play with it.
Ubuntu has a package for it, but that package appears to be missing it's scripting language bindings. I expect the build is also quite old and i fear may be dropped in coming Ubuntu releases.
Con Development has been on pause for a while due to lack of time on the part of the original developer
It's open source, so someone else could pick it up, but no one has at this point.