Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Slack - A messaging app for teams who see through the Earth!
SAP HANA - SAP HANA is an in-memory, column-oriented, relational database management system.