I built several things things that work in tandem:
- x, which is a lightweight jQuery-inspired DOM manipulation library.
- xAct, which is a simple templating engine built for simpler websites.
- xJax, which is really just a wrapper around the fetch api to make it slightly simpler.
- xOS, a browser-based "operating system" written entirely in JavaScript
- xCloud, the backend server for xOS
These are all over at The X Project.