What are some promissing FOSS projects?

I mean, universally promising. No niche shit. What are the next "Linux" and "GCC"?

>>20
I'm presuming you're serious and not sardonic. I am a Hurd fan and I follow Hurd development very regularly. I will tell you now that Hurd is currently immature to replace Linux. Even when the Hurd team completes its DDE project, there are still plenty of other work that needs to be done before

http://wiki.tudos.org/DDE/DDEKit
http://www.gnu.org/software/hurd/tag/open_issue_hurd.html
http://walfield.org/papers/200707-walfield-critique-of-the-GNU-Hurd.pdf