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.
Synthesio - Synthesio is a social intelligence tool or a marketing software that is specially made for the purpose of social media monitoring and social analytics.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Swift Social - All-in-One Social Media Growth and Management Tool
Slack - A messaging app for teams who see through the Earth!
Opteo - Opteo searches for statistically significant patterns in an account and creates "optimization tasks" to improve account performance.