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.
Experlogix CPQ - Proposal management, quoting, and product configurator
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Oracle CPQ Cloud - CPQ software & Quote-to-Cash app
Slack - A messaging app for teams who see through the Earth!
CloudSense - CPQ and order management native to Salesforce