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InfluxDB
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This is using only the CPU to render, but there are rendering functions from the library used to access the RSP/RDP (read as essentially the GPU). Although they are not used here (as far as I can tell). The library used is Libdragon (https://github.com/DragonMinded/libdragon) and it provides an open-source, non-proprietary C library for doing 2D graphic. Again, essentially Nintendo can't DMCA/Copyright strike it down. Kinda like that Mario 64 reverse engineering.
I'm pretty sure there is a Wolfenstein port to the N64 floating around, as well as jnmartin84/aw64: nintendo 64 port of https://github.com/fabiensanglard/Another-World-Bytecode-Interpreter/ which I haven't tested but is a port of Another World.