PlantUML : PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language
Grist : Grist is a modern relational spreadsheet. It combines the flexibility of a spreadsheet with the robustness of a database.
Astuto : Astuto is a free, open source, self-hosted customer feedback tool. It helps you collect, manage and prioritize feedback from your users.
CryptPad : CryptPad is the Zero Knowledge realtime collaborative editor.
Encryption carried out in your web browser protects the data from the server, the cloud ...
Taiga.Io : Taiga is a project management platform for startups and agile developers & designers who want a simple, beautiful tool that makes work truly enjoyable...
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.