Best Mattermost Alternatives - 2025

Slack is an application that helps teams communicate and work together by combining messaging, file sharing, and app integrations in one place. It makes it easy for teams to stay connected and work efficiently, whether they are in the office or working remotely.

Find and request open-source alternatives to apps you already use.

Wire™ is the most secure collaboration platform, transforming the way businesses communicate at the same speed that our founders disrupted telephony with Skype. Featuring messenger, voice, video, conference calls, file-sharing, and external collaboration – all protected by the most advanced end-to-end encryption.

Noor is the chat app for teams who want to ship cool things _together_. Slack has been primarily serving large enterprises and doesn't care about building high quality software. Noor is a native app, focused on simplicity, teamwork and speed.

In addition to the cool name, and great new perspective to work/chat/collab experience, I adore how you nicely mention people who helped you and the tools you use :) And now for the feedback: 1. Tasks and daily chats are great, I can see this as a major pain point for many remote/hybrid teams. Even though in Slack you can technically achieve similar behavior using a bot + chat named daily, having a focus in the actual tool is way better in many ways. 2. "Physical space" is not something I would use a lot, but might be useful for some teams I guess. 3. Having a whiteboard to load within the app would be nice to have 4. A decent search capabilities 5. It would be nice to have a home section next to the "tasks" button. Use case: The section would have a grid of links (like apps on mac os or bigger cards). This would be useful to have a common place for the team to have a single place with all assets, be it a notion page, docs, other links, etc. Number 5 is my personal favorite (after number 1, of course 😅) because I switched from Slack to JetBrains Space for a few reasons: 1. Losing my history and not being able to search properly for what I didn't lose yet. (Noor doesnt have such issue as far as I can tell) 2. It was nice to have everything work related in one place. Although, now I realize there is too much clutter in JetBrains Space, so whatever you add to Noor, please make sure it's really needed there, or let people hide it. 3. Kanban board, actually not just the board, but the fact how easy it is to share tasks with the team and invite them to a task by mentioning the person and following the discussion in the chat. In other tools, you would have to share links, go to another tool in the browser, and go back to discuss the task, etc. Whilst this is a nice feature, I believe it is not a good fit for Noor, just mentioning why we switched to JetBrains Space. > A lot of people told us that don't compete with big players A lot of people say the same for what we are doing, but hopefully in 5-6 months we will release a great competitor :)

Range helps your team build alignment with a daily habit that saves time and builds culture along the way. Range keeps your team connected, focused, and productive no matter where they’re working.

Product's problem statement is spot on they are solving it quite effectively Overall they have a well thought out and executed solution

All-in-one secure chat app for teams, friends and organisations. Keeps conversations in your control, safe from data-mining and ads. Talk to everyone through the open global Matrix network, protected by proper end-to-end encryption.

I have been using Riot on Matrix for over a year with the team and it was never a problem. The app is getting better and safer and better and that is way more important than emoji updates