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.
Salesflare - Simply powerful CRM. Automates your data to build better relationships and make more sales.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
17hats - The all-in-one business system for entrepreneurs.
Slack - A messaging app for teams who see through the Earth!
LinkPoint Connect - LinkPoint Connect: Desktop Edition for Salesforce links the work you do in your email to the records you need to update in the CRM.