APIsList - The APIsList is the directory for all the public APIs compiled from different open sources and enhanced its data with the APIsList parsing engine.
Calndr.link - Dead simple & free add to calendar links + API
Hero - Hero offers student behavior management applications for K-12 schools.
Add-to-Calendar Button Generator - This open source projects lets everybody create amazing buttons, where users can add events to their calendars.
Alpaca Crypto API - Alpaca is excited to launch the public beta of its newest product, Alpaca Crypto API.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.