Phunt - Product Hunt command line interface
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.
Haxor News - A Hacker News command line interface
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Slack - A messaging app for teams who see through the Earth!