I have way too many to list, so I figure that I'll list one old school one that I have been using for years and one that I only started using in 2016.

This year, I made my first foray into building non-trivial web applications with Angular. Despite (or perhaps because of) that, I was quickly filled with a brand new respect for good old jQuery. I have yet to find such a simple, maintainable, readable way to parse complicated DOMs.

https://github.com/jquery/jquery

I first started working with the Slim Framework in March. Over those nine months, it has become an absolutely indispensable tool for me.

https://github.com/slimphp/Slim