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Why no open source Steam clients?
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That project does its job by running steamcmd, which is an official Valve client, not by calling public APIs.
That could be a viable way to implement parts of a Steam client, but since it depends on a proprietary tool, it wouldn't be all open-source.
Edit: I wonder if Valve would be receptive to publishing the SteamCMD source code. They already have a github presence.