Available on Steam
Steam is an Internet-based digital distribution platform developed by Valve Corporation offering digital rights management (DRM), multiplayer, and social networking. Steam provides the user with installation and automatic updating of games on multiple computers, and community features such as friends lists and groups, cloud saving, and in-game voice and chat functionality. The software provides a freely available application programming interface (API) called Steamworks, which developers can use to integrate many of Steam's functions into their products, including networking and matchmaking, in-game achievements, micro-transactions, and support for user-created content through Steam Workshop.
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With an updated library of games for the PC, from single player to multiplayer, free-to-play to fully paid, triple A to thousands of indie games – Steam is the largest online digital retailer for PC games. Among the most popular free to play games are – DOTA 2, CS: GO and Team Fortress 2.