Game sites with chess variants.

Chess.com is the best website for chess I've ever been on but if you're interested in other stratigy games or chess variants than you'll have to go somewhere else.

itsyourturn.com is one I like.  It's a good correspondence site that has over 10 chess variants as well as many other games.

Any other good ones?

lichess.org is the best for live 960 and has correspondence, and other variants as well. Good site.  

Brain King has a few varients. A good site.

SchemingMind has some nice variants, including Benedict chess and Benedict960.

I love variant chess. Try the app (and I believe there is a site too) for Jocly Chess Variant.

What website has progressive chess?

I hope my idea of chessplus is a unique one. chessplus.wordpress.com.