Gamecreate is one we used to use. They provide all the server files for installation also and allow restricted access for users. Restarts game server on crashes. Very easy to use. They offer next to no support but it's simple enough.
We now use UGCC which allows restricted access, but the free version has limitations, but has everything we need. Doesn't restart servers on crashes. A little more work than Gamecreate but not much of an issue. Offer very fast support through their forum.
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