CSS Wand - Easy copy-paste beautiful CSS animations
GitSpo - Measure & engage your open-source community
App Animations - Gallery of beautiful iOS animations to inspire your next app
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.