For a more up to date list with working links: http://geekbio.com/forums/threads/full-free-pc-downloadable-games.14/ I suck at all these games :) Here I show...
23 Free Full PC Games (13 Online Multiplayer) To Download
How to play multiplayer games online (Using Hamachi)
TOP 3 ANDROID MULTIPLAYER GAMES
Top 3 Multiplayer Mobile Games ( Android / IOS )