TCAdmin has been I would say the best since version 1.
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Not all of us have the funds to shell out to build a custom game panel for our game server needs unless you are offering
But I said out of GameCP and TCAdmin, TC wins hands down.
We're looking into desiginng and coding our own in-house panel. We've basically taken the lessons we've learned (What we like, what we don't like, etc.) from control panels such as TCAdmin v2, Multicraft, McMyAdmin, GameCP, and custom ones like MPServ's Wrench and Fluctis Hosting's GCPanel and we'll be applying it to our own.