Outline : Team wiki, documentation, meeting notes, playbooks, onboarding, work logs, brainstorming, & more…
Zulip : Powerful slack-like open source group chat
bosh : BOSH is an open source tool for release engineering, deployment, lifecycle management, and monitoring of distributed systems.
Superset : Apache Superset is a modern data exploration and visualization platform
Astro : Astro is an all-in-one web framework for building fast, content-focused websites.
CryptoZombies is a free, open source, interactive code school that teaches you to build games on Ethereum. The course is designed for beginners to Solidity and starts off with the absolute basics.