Not actually a server, more of an improved version of BlockProxy All you can find here is a working ENet proxy and packet analyzer with some progress on reverse engineering the network protocol and world formats
For proxying the game, checkout the class com.juanmuscaria.blockheads.intercept.BHInterceptor
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it has all the fancy stuff for that.
This mess contains code from when I was stupid, with little to no clean up from less stupid but still stupid present me, It's a complete mess, and the jna code should not be used at all, most stuff here is for research purposes