Project64k is an online Nintendo64 emulator that uses Kaillera Netplay, and the additional P2P option (comes with the Kaillera Client) and AQZ option (input plugin). Project64k on Kaillera cannot properly sync many games, however It can play the main games played just fine.
-Super Smash Brothers 64 (All versions including Quick Match Rom Hack by Madao)
-Super Mario 64 Multiplayer Rom Hack/and Star Road Multiplayer Rom Hack
-Mario Kart 64 (All Versions)
To play games like Goldeneye007 or Perfect Dark on Kaillera you will need Mupen64k the alternate (less stable) Project64k.