CTO.ai - Build, share & run developer workflows in the CLI + Slack
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.
Trello for Slack - Organize anything with anyone, inside Slack
GoodGantt - The best Gantt chart for Trello®
Troopr Assistant - The AI assistant for Slack
Paws for Trello - The best way to use Trello on your desktop