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InfluxDB
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If you don't mind a shameless plug, I made a C library for receiving and transmitting DMX for use on an ESP32, which is like an Arduino on steroids. More info can be found here if OP/anyone is interested. It's perfect for use as a custom DMX relay or for a homebrew DMX decoder.
There are a quite a few out there, but mathertel's is really great for any Arduino. I believe he has a DMXSerial2 library that can do RDM that is worth checking out too!
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.