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.
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Vue.js - Reactive Components for Modern Web Interfaces
Slack - A messaging app for teams who see through the Earth!
React - A JavaScript library for building user interfaces