Article taken from GamingOnLinux.com.

Good news for any Unity3D developers! Ludosity has open sourced their Steamworks wrapper and made it free.Find the source code here Hopefully this can stop future games using Steamworks wrappers that have finicky Linux support, so they could just use this one instead and even help improve it if they wish.A wrapper like this is apparently the cause of the delay for 7 Days To Die getting a Linux version for an example off the top of my head.I cannot imagine why anyone would go with a different Steamworks wrapper now. Not only is it open source, but it is rammed full of features too.Ludosity's Steamworks Wrapper is a fully managed .Net wrapper of Valve's Steamworks SDK. It supports Windows, Mac and Linux!This wrapper has been used to succesfully deploy several Steam-games.Features:* Achievements* Apps* Cloud* Stats* Friends* Leaderboards* Matchmaking* MatchmakingServers* GameServer* GameServerStats* Networking* Screenshots* Utils* HTTP* Big Picture Mode* Steam Controller* SteamVRSee their blog post on it here