The software behind imageboards is what will power the next generation of imageboards, and by extension, is what the future generation of imageboard users will be familiar with. Although not looked at often, imageboard software is one of the most important parts of the imageboard world. Without it, we wouldn't have our imageboards, and without new imageboard developers, we would still be stuck in the Kusaba days.

Repos you could consider contributing to:
https://gitgud.io/LynxChan/LynxChan
(more will be added upon request)

I myself am learning to program, and hope to contribute soon.