Slack is a company collaboration tool that uses instant messaging to replace email.slack.com
Trello’s boards, lists, and cards enable you to organize and prioritize your projects with you and your team.
G Suite is an integrated suite of secure, cloud-native collaboration and productivity apps powered by Google AI. Includes Gmail, Docs, Sheets, Slides, Drive, Calendar, Meet and more.
monday.com powers teams to run processes, workflows, and projects in one digital workspace, with a code-free environment. Check out their post on Collaboration Software, which goes into the in's and out's of collaborating as a team.