You can learn more about Crystal Space at http://www.crystalspace3d.org/
Crystal Space is accepting donations at https://sourceforge.net/donate/index.php?group_id= 649
This money will be used to get a new linux computer which is needed to better support Crystal Space on linux. At this moment Windows, Linux, and MacOS/X are supported by Crystal Space but most of the active developers are on Windows which means that that platform gets most attention. I have a linux computer but it is underpowered which makes it bad for testing the latest CS features on linux too.
If you feel that this is a good use for your money then head over to the donation area at https://sourceforge.net/donate/index.php?group_id= 649
Greetings and thanks for your support!"