Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.

Offers unified communication for teams with advanced real-time messaging, contextual features, versatile chat tools, and organized conversations in dedicated channels with integrated file sharing on Mac, Windows, Linux, and mobile platforms for enhanced productivity.

Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.

Mattermost is a secure, open source platform for communication, collaboration, and workflow orchestration across tools and teams.

Foam is a personal knowledge management and sharing system inspired by Roam Research, built on Visual Studio Code and GitHub.

Nuclino is a unified workspace where teams can bring all their knowledge, docs, and projects together in one place. It’s a modern, simple, and blazingly fast way to collaborate, without the chaos of files and folders, context switching, or silos.

Working on a project, researching a topic or writing an article? Walling makes it easy to break down your ideas, refine them and visually organize them.

Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time.

A comprehensive collaboration platform within Office 365, providing centralized chat, file sharing, and HD video meetings. Accessible on multiple platforms, it offers enterprise-grade security and compliance, customizable notifications, and private to group chat sessions.

Widget Board is a productivity tool that lets you create custom boards with your favorite widgets such as tasks, notes, media, date & time, weather, calendar and so much more!.

Slite is a unified platform for remote team collaboration, providing a space for documentation, discussion, decision-making, and task execution. It features a robust editor with advanced capabilities, video explainers, sketching tools, and numerous integrations.

Kosmi is a free real time application and communication platform that offers voice, text and video calls along with games and applications such as SNES Party, NES Party, OpenArena, Poker, Virtual Cardtables, Synced YouTube and Cowatch Video.