I use and recommend:
https://r.rpol.net #RPOL
https://roll20.net #roll20
I've also had good experiences with Myth Weavers:
Only reason I don't use them more is they've got strict PG-13 content restrictions and I'm more of an 'R is for RoboCop' kind of umpire.
All strongly n00b and lgbt friendly, the first two have strong selections of games other than D&D. The two webforums, RPOL and M-W, have sections where you can ask this question again.
Currently playing #MarvelHeroicRoleplaying on #RPOL; the Watcher has kindly allowed me to play one of my favorite characters: April "Mayhem" (or "Auntie M") Parker as of... approximately fifteen minutes after her death in Spider-Girl: the End. (In a different timeline.)
Currently playing #DresdenFilesRPG in my living room. Playing freelance Special Agent Lindburgh, alien hybrid/faerie changeling infiltrator, memetic sex god. Only his friends call him "Chuck".
#marvelheroicroleplaying #rpol #dresdenfilesrpg