Doodle Bot for Slack - Simple tool to find meeting times on Slack
SlimPlanner - Team scheduling, resource planning, task management
adam.ai - Intelligent meeting management platform for teams & managers
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.
Avoma - An AI meeting assistant with conversation intelligence
WorkPatterns - The modern manager's toolkit: 1:1s, feedback, & recognition