Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
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.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Android Studio - Android development environment based on IntelliJ IDEA
Slack - A messaging app for teams who see through the Earth!