Something I haven't seen mentioned yet: For a developer to become involved with a new project requires some substantial cognitive overhead to learn what files matter, the terminology and basic flow of data through the codebase, etc. There may be interest in having someone with your skillset create "Introduction to Hacking Foo" presentations. For example, if someone offered to tell me the main components of how django works in an easily accessible style with plenty of helpful visual accompaniments, I'd be thrilled. While I can figure those things out, that figuring takes time/reading/effort and anything that could potentially reduce that effort is just great IMO

If your content is good enough and you're passionate about such an idea, I could see a series of these introduction videos/slides/blog posts being a really popular series