Good non-downloadable online multiplayer games?

[The Murderous Cop]

/title

The game needs to be a non MMORPG, and has private server support (no one else can join except the people you invite).

I know of Board Game Online, Pretend You're Xyzzy, and a couple others I can't name.
Fire away.

[Ad Bot]

[Foxscotch]

and a couple others I can't name.

explain

[Trogtor]

http://www.cross-code.com/en/start

this is just a demo to a game thats (currently early access) on steam

very good game though. They used to have a download link with a fairly lengthy demo which the steam version doesn't do, im guessing they changed this too

[Freedom Bringer]

An old game called shso, I dunno if it is still up.
Aot tribute?
Jelly battle just crashes.
Club penguin if you are desperate.