If you're a Steam user who enjoys free-to-play games, then you'll be happy to know that Valve just introduced support for five F2P titles on the digital platform. Available immediately, the launch titles are Spiral Knights, Forsaken World, Champions Online: Free for All, Global Agenda: Free Agent, and Alliance of Valliant Arms.

If you're interested in trying out any of these games, be sure to keep an eye out for special deals throughout the week. Here are the details:

"Beginning tomorrow (Wednesday) with Spiral Knights and concluding Sunday with AVA, each of the five launch titles will offer exclusive in-game content to those who try the 'F2P game of the day' on Steam. In game transactions in all of the titles will be supported by Steam's micro-transaction backend system that is available to Steamworks partners and currently used in Valve's Team Fortress 2."

For more details, check out the FAQ. Which free-to-play games will you be playing on Steam?