The best alternatives to Mattermost are Slack, Opensource Builders, and Wire. If these 3 options don't work for you, we've listed over 10 alternatives below.
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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.
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.
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.
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.