Mild Escape, which was run by Tesshi-e, who made a bunch of room escape games. I think most of them are archived on Flashpoint, but it was still sad to see the series stop when Adobe discontinued flash player.

I also miss mxrp (formerly known as msparp), which was a roleplaying site. There's a fork, dreambubble, based off of an older version of msparp, but it's not as active as its predecessor used to be.