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InfluxDB
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Like diablo1 for example. The code was reversed and open sourced so development of the game and mods can be done easier and shared https://github.com/diasurgical/devilutionX
A good dude's been working for a while on rebuilding D2 in the open (on top of libgdx), he deserves a mention too: https://github.com/collinsmith/riiablo
I saw this implementation in Go https://github.com/OpenDiablo2/OpenDiablo2 and they say so far you can launch the game and run around in town!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.