I made a PHP-based one a while ago before Duolingo offered Swahili. It probably needs a little upgrading, ha. A cool project and you can do it for most things. Oh plus it’s raw PHP so snappy as heck you youngins. https://github.com/ryanchausse/githeri

I am a homeless man in San Francisco because I quit a public sector job that I was not allowed to fix with my good-ass coding skills. I have no regrets.