XBConnect is described as 'is software that runs on your PC and will let you play Microsoft Xbox/360 games and Sony PSP games with players from around the world. Imagine plugging your Xbox/360 or PSP into a LAN that went around the planet'. There are four alternatives to XBConnect for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Playstation. The best alternative is PlayStation Network, which is free. Other great apps like XBConnect are Xbox Live (Freemium), XLink Kai (Free) and XBSlink (Free Personal, Open Source).
PlayStation Network, often abbreviated as PSN, is an online multiplayer gaming and digital media delivery service provided/run by Sony Computer Entertainment for use with the PlayStation 3 and PlayStation Portable video game consoles.
Xbox Live (Silver) is free for basic features such as messaging and dashboard and game updates. Xbox Live Gold (paid subscription **) is required for match making and may be required for other game functionality over the internet. The most advanced multiplayer.
XLink Kai is a global gaming network - bringing together XBox 360, XBox, Playstation 3, Playstation 2, Gamecube and PSP users, in one integrated community. It is software running on your PC or Macintosh that allows you to play system-link enabled games online for free.