https://gitler.moe/ryo/ryogit
It's a PHP project of just 78 lines of code total (76 in index.php + 2 in style.css), and it works perfectly, it's instantly fast, it's bugfree, it's exploit free, it's easy to read, modify, and redistribute, you can even run it on a literal potato just fine, and it's considered "bad practise" by soydevs these days.
It only took me a few hours to make too.