MZVGBP Online Games
In mostly reverse chronological order:
Not Actually Online But Worth Pointing Out?
- Blocks (2013)
- FTL (2012)
- Dwarf Fortress (2008, 2011, ...)
- Quake II in HTML 5 (2010)
- foldit (2008) — the protein folding game for science! Requires installing client software on a computer with a decent video card. Note that the ownership of any resulting discoveries is not at all clear.