Swatches - A fun and accurate color picker for the real world
Filestack - Simple file uploader and robust APIs for uploading, transforming, and delivering any file into your app. Filestack is a collection of tools and powerful APIs that make it simple to upload, transform, and deliver content.
ColorSnapper - The missing color picker for Mac.
Elph Plasma - Highly scalable blockchain infrastructure for Ethereum
Sketch Palettes - Sketch plugin to save and load colors into the color picker
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.