Porting one of the fine Plan 9 based filesystems to Linux seems like an excellent operating systems project. This would directly benefit Glendix as many applications require these synthetic filesystems provided by the Plan 9 kernel.

/net is a good example of how sockets are done away with, and /dev/draw provides a useful graphics API. You could argue in your project thesis that filesystems sometime provide a better abstraction than traditional programming-language based APIs; and prove it by porting one such filesystem over to Linux.