![]() Server written in Python (Twisted + Django).In addition to working in the browser, Zulip also has native desktop and mobile applications for iOS, Android, Linux, Mac, and Windows so you can chat on almost any platform. Zulip features group and direct messaging, private groups, threaded conversations, in-line media previews, email and desktop notifications, and tons of integrations. The application now lives on as an open source project. Zulip was originally an independent application before Dropbox acquired the company that built Zulip before the product even officially launched. Uses APIs, hubot, or webhooks to receive notifications from third-party services.Supports voice/video chat and screensharing.Native desktop and mobile apps created using Meteor. ![]() Code is a mix of CoffeeScript and JavaScript.Uses Meteor platform, including Blaze for frontend.Upcoming features include OTR messaging, XMPP multi-user chat, Kerberos authentication, file sharing via p2p and scalable multi-cast, and much more. Developers can use hubot to integrate with popular services like GitHub, Gitlab, Confluence, JIRA, and more. Rocket.Chat also has a Sandstorm app so you can easily host your own chat server. There are native applications for Windows, Mac, and Linux, as well as mobile applications for iOS and Android. Rocket.Chat is one of the most feature-rich open-source Slack alternatives, featuring group chat, direct messaging, private rooms, desktop notifications, media embedding, link previews, file uploading, voice/video chat, screensharing, and more. Use the same webhooks as Slack to post messages from third-party applications.Import user accounts, channel archives, and themes from Slack.Backend written in high-performance Go language.Mattermost offers several features that Slack doesn't have, including search by hashtag, non-English channel names for multi-lingual teams, auto-highlighting of everything you write, and comment threads for easy-to-follow conversations. Features include full markdown support, file uploads, archiving and search, and customizable themes, even allowing users to import their chat history and favorite themes from Slack. Mattermost offers group chat, direct messaging, and private chat rooms. Sandstorm support makes self-hosting easier for non-technical users.Ongoing development from Security Compass.Let’s Chat also has a Sandstorm app, making it easier for non-technical users to host their own Let’s Chat server. Features include group chat, direct messaging, and private channels, along with many standard Slack features such as emojis, image embedding, and code pasting. Let's Chat, built by the company Security Compass as a 10% time side-project, is one of the oldest and most popular open-source Slack alternatives with over 7,000 stars and 960 forks on GitHub. Empty testing suite, mitigated somewhat by having few features to test.Limited features only supports group chat and direct text messaging + emojis.Works offline using Bonjour or LE Bluetooth.Allows communication even if central server goes down.WebRTC connects peers, data is propagated using Hyperlog.Message authentication currently relies on GitHub but could be modified to use a decentralized alternative such as Blockchain Auth. As part of our own search for a self-hosted Slack alternative, we reviewed the options out there.įriends is unique among the Slack alternatives due to its use of peer-to-peer technology. Today there are a growing number of open-source Slack alternatives available for people who want to avoid the trap of walled gardens and have more control over the security of their data. While Slack offers many benefits to customers, there are also downsides to using the platform, including high subscription fees and the risk of a massive leak of private data if Slack’s servers are ever breached ( again). Slack is a popular team communications application for organizations that offers group chat and direct messaging for mobile, web, and desktop platforms. Update: We made a huge mistake in forgetting to review Riot - the only Slack alternative based on an open protocol, and the only Slack alternative to support end-to-end encrypted group chats.
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