One X Original Android Development - xda-developers
The above link has AOKP Jellybean and CM10. Both are still alpha quality, and suffer from the same problems. Camera is iffy, Video Camera is non-existant, call quality issues for some, speaker phone issues, BT issues... basically all the usual problems when the devs do not have the proper source code from HTC. I think kernel source is the main stumbling block, as usual.
If you do not need the camera, do not need Facebook app (kills battery) and are willing to tolerate poorer battery life... you can get on the Jellybean train now. I put it on there just to see, and it does feel snappy. But then all ROMs do when fresh and new. If you are one of those with call quality issues, you will want to have a nice backup of your current setup to restore.
The CM9 ICS rom has slightly better camera/video camera performance, and less serious battery issues I believe, but I stopped keeping up when CM10 came out.