There are various ways to use CrystalSpace to develop games. In general they are covered in the manual.
A custom jam version is used.
CS supports the following platforms:
-x86 -ppc -win -linux -osx
See the List of reportedly working platforms for more detail.
Crystal Entity Layer
Additionally there is a related project named CEL that adds an entity layer and game logic to the engine.
Frequently asked questions are answered in the FAQ.
The HowTo section gives details on various smaller tasks.
Found a bug? Please report it.