OrientDB - OrientDB - The World's First Distributed Multi-Model NoSQL Database with a Graph Database Engine.
ProppyJS - Functional props composition for UI components (React & Vue)
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Appbase.io - Search stack for building modern apps
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Reactive Search - UI components for building Amazon / Yelp like Search