GitHub - YahnisElsts/plugin-update-checker: A custom update checker for WordPress plugins. Useful if you don't want to host your project in the official WP repository, but would still like it to support automatic updates. Despite the name, it also works with themes.
GitHub - Simonwep/pickr: 🎨 Flat, simple, multi-themed, responsive and hackable Color-Picker library. No dependencies, no jQuery. Compatible with all CSS Frameworks e.g. Bootstrap, Materialize. Supports alpha channel, rgba, hsla, hsva and more!