There's a retrospective of 2010 post on OGRE's blog. Here are some interesting FOSS projects they mentioned:
|Hovercraft||Game||GPL*||Racing *Depends on non-free fmod, havok and zoidcom|
|Island Hopping||Game||WTFPL*||Platformer *Depends on non-free irrklang|
|MOGRE||Library||MIT||Bindings for .NET|
|OgreKinect||Library||MIT||Input library for Kinect|
|OgreProcedural||Library||MIT||Procedural geometry library|
|OpenSpace3D||Tool||LGPL*||Scene Editor *Depends (?) on non-free newton physics|
|Spacescape||Tool||MIT||Create space skyboxes with stars and nebulas|
|Zen Engine||Library||ZLib||3D game engine client framework|
Spacescape running in Wine
I wasn't able to build Spacescape SVN but the 0.3 release runs fine in Wine.
Island Hopping's game over screen
Island Hopping's dependency on irrklang is probably easy to replace, so I gave it a try using Wine with success (broken sound though, go figure).
OpenSpace3D wouldn't start in wine and I don't know if it's build-able on Linux.