GeomSpace is interactive geometry software for different geometric spaces. You can build your own universe of any dimension and with any geometry. You can choose Euclidean, elliptic, hyperbolic, or Minkowskii, among other spaces.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This is the first version tagged as "Beta". GeomSpace was ported to the FLTK user interface to address unsolved past issues. The Windows port was divided into 32 and 64 variants, and a new Mac OS X port was added (it is still rather buggy).