From Christophe Thibault:
Enables emulators to play on the Internet. It consists of a client and a server. The client is usually embedded into your favorite emulator and the server is a stand-alone application that needs to be run on a machine directly wired to the Internet. Kaillera features: - Small, fast and efficient C++ code. - UDP use for better latency. - Intelligent networking cache code. - Multi-platform support. - Low to no lag for players with good ping. - Works through firewalls. - LANs/WANs support.