Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Brusher - Tiny library to add interactive backgrounds to webpages
PiPer - A DIY Minecraft computer to build gadgets
Webflow Interactions - Design and build web animations and interactions
Pennywise - Cross-platform application to open any website or media in a floating window
Spott - API to work with cities, countries and political divisions.