Trello

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Kanban-style board app for task collaboration. While often classed under project management, many teams use Trello as a simple collaboration tool to organize ideas and tasks visually on boards. It supports file attachments, comments, checklists, and real-time updates for team coordination.
Microsoft 365 provides additional collaboration tools like SharePoint (for intranet portals and document collaboration) and Yammer (enterprise social networking). SharePoint allows teams to co-author documents and build shared sites; Yammer enables company-wide conversations and communities in a social feed format.

Google Meet

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Video conferencing service within Google Workspace. Allows easy scheduling via Google Calendar and one-click browser-based meetings (no software install). Supports screen sharing, recordings, and live captioning. Integrated with Gmail/Calendar, making it a convenient collaboration tool for Google users.

Slack

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Leading team communication platform for channels-based messaging. Supports real-time chat, file sharing, voice/video calls, and integrates with hundreds of other tools, making it a hub for team collaboration.

Microsoft Teams

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Comprehensive collaboration suite by Microsoft. Combines persistent team chat, video conferencing, file storage (SharePoint/OneDrive), and Office 365 integration. Tightly integrated with Office apps, great for businesses already in the Microsoft ecosystem.