Free picks · Linux
Best free communication apps for Linux (2026)
Every pick is listed under Communication in our directory, runs on Linux and is completely free or has a free plan. We rank them by our rating and popularity, then favour tools made mainly for communication and apps built for Linux.
Short answer
The best free communication apps for Linux are Discord, Ferdium and Flameshot, the top three of 20 matches in our directory. 6 of the 10 picks are completely free and the other 4 have a free plan; 7 are open source.
Updated
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
At a glance
Counted from the top 10 picks, except the total.
- Matching tools
- 20
- Completely free
- 6
- Open source
- 7
- Work offline
- 4
- Native apps
- 4
Comparison table
“Free plan” means a free tier with paid upgrades. A dash in Licence means our directory does not list the tool as open source.
| # | Name | Pricing | Platforms | Licence | Why pick it |
|---|---|---|---|---|---|
| 1 | Discord | Free plan | Web, Windows, macOS, Linux, iOS, Android | — | Free voice, video and text chat for communities, friends and small teams. |
| 2 | Ferdium | Free | Windows, macOS, Linux | Open source | All your messaging and work apps together in one desktop window. |
| 3 | Flameshot | Free | Linux, Windows, macOS, Offline | Open source | An open-source screenshot tool with quick, built-in annotation. |
| 4 | Signal | Free | Android, iOS, Windows, macOS, Linux | — | A free, end-to-end encrypted messaging app run by a nonprofit. |
| 5 | Slack | Free plan | Web, macOS, Windows, Linux, iOS, Android | — | Team communication organised into channels. |
| 6 | LibreTranslate | Free | Web, Linux | Open source | Translate text on your own server without sending it to a big company. |
| 7 | Mattermost | Free plan | Web, Windows, macOS, Linux, iOS, Android | Open source | Self-hosted, open-source team chat with a free edition for small teams. |
| 8 | Thunderbird | Free | Windows, macOS, Linux, Android, Offline | Open source | A free, open-source email client for managing several inboxes in one place. |
| 9 | Zulip | Free plan | Web, macOS, Windows, Linux, iOS, Android | Open source | Open-source team chat where every conversation has a topic, so threads stay readable. |
| 10 | Kooha | Free | Linux | Open source | A simple screen recorder for Linux. |
Why each pick made the list
Every reason is taken from the tool's own listing: its categories, platforms, features, rating and pricing.
Our top Linux pick, rated 4.5/5. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Web, Windows, macOS, iOS and 1 more platform. Its listing says it is easy to pick up (7 of 10 here). On our Mac list it is number 1.
Watch out for: Built for communities, so admin and compliance tools are thin for businesses
Number 2 of 10 for Linux, rated 4.5/5. Made mainly for communication, one of 8 such picks here. A desktop app that runs on Linux, and also on Windows and macOS. Its listing says it is privacy-focused (5 of 10 here) and is easy to pick up (7 of 10 here). On our Mac list it is number 2.
Watch out for: Each service runs as a web view, so it can use a lot of memory
Number 3 of 10 for Linux, rated 4.6/5. Made mainly for communication, one of 8 such picks here. A desktop app that runs on Linux, and also on Windows, macOS and Offline. Its listing says it works offline (4 of 10 here) and is easy to pick up (7 of 10 here). On our Mac list it is number 3.
Watch out for: No screen recording
Number 4 of 10 for Linux, rated 4.7/5, the highest here. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Android, iOS, Windows and macOS. Its listing says it is privacy-focused (5 of 10 here) and is easy to pick up (7 of 10 here). On our Mac list it is number 5.
Watch out for: The people you talk to need Signal too
Number 5 of 10 for Linux, rated 4.2/5. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Web, macOS, Windows, iOS and 1 more platform. Its listing says it has AI features (the only one here) and is easy to pick up (7 of 10 here). On our Mac list it is number 6.
Watch out for: Can become a distraction engine
Number 6 of 10 for Linux, rated 4.5/5. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Web. Its listing says it works offline (4 of 10 here) and is privacy-focused (5 of 10 here). It is not in the Mac top 10 (not listed for Mac).
Watch out for: You must set up and host it yourself
Number 7 of 10 for Linux, rated 4.4/5. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Web, Windows, macOS, iOS and 1 more platform. Its listing says it is privacy-focused (5 of 10 here). On our Mac list it is number 8.
Watch out for: You need to run and maintain your own server
Number 8 of 10 for Linux, rated 4.5/5. Made mainly for email, it is one of 2 picks here that cover communication as a second use. A desktop app that runs on Linux, and also on Windows, macOS, Android and Offline. Its listing says it works offline (4 of 10 here), is privacy-focused (5 of 10 here) and is easy to pick up (7 of 10 here). It is not in the Mac top 10 (11th for Mac).
Watch out for: Interface can feel busy at first
Number 9 of 10 for Linux, rated 4.5/5. Made mainly for communication, one of 8 such picks here. Runs on Linux, and also on Web, macOS, Windows, iOS and 1 more platform. It is not in the Mac top 10 (12th for Mac).
Watch out for: Free cloud plan only searches the latest 10,000 messages
Number 10 of 10 for Linux, rated 4.5/5. Made mainly for personal productivity, it is one of 2 picks here that cover communication as a second use. A desktop app that runs on Linux and nowhere else. Its listing says it works offline (4 of 10 here) and is easy to pick up (7 of 10 here). It is not in the Mac top 10 (not listed for Mac).
Watch out for: Linux only
Running these on Linux
Counted from each pick's listing type and platforms.
- By listing type, the 10 Linux picks are 5 web apps (Discord, Slack, LibreTranslate, Mattermost and 1 other), 4 desktop apps (Ferdium, Flameshot, Thunderbird and Kooha) and 1 mobile app (Signal).
- 4 of 10 are apps you install on Linux; the other 6 are web or cloud tools listed for Linux.
- Kooha is listed for Linux and nothing else. Discord reaches furthest, on 5 other platforms besides Linux.
- 6 of 10 also run on Android, so the same tool can follow you between Linux and Android; Ferdium, Flameshot, LibreTranslate and Kooha do not.
How this list compares
The same search on other platforms. Only the differences are named.
- Free communication apps for Mac
6 of these 10 Linux picks also make the Mac top 10. 4 are on this list only: LibreTranslate (not listed for Mac), Thunderbird (11th for Mac), Zulip (12th for Mac) and Kooha (not listed for Mac). In their place the Mac list has Lightshot, Loom, Jumpshare and Shottr; none of them is listed for Linux.
- Free communication apps for iPhone
5 of these 10 Linux picks also make the iPhone top 10.
More matches
10 more free communication apps for Linux in our directory, in ranked order.
Frequently asked questions
- What is the best free communication app for Linux?
- Discord is our first pick. Free voice, video and text chat for communities, friends and small teams. Discord has a free plan, with paid plans that unlock more features or usage.
- Are these communication apps really free?
- Yes, every pick is free to start. Ferdium, Flameshot, Signal, LibreTranslate and 2 others are completely free. Discord, Slack, Mattermost and Zulip have free plans with paid upgrades.
- Which of these communication apps are open source?
- Ferdium, Flameshot, LibreTranslate, Mattermost, Thunderbird, Zulip and Kooha are tagged open source in our directory, so you can read the code of each and, depending on the licence, self-host or modify it.
- Which ones work offline on Linux?
- Flameshot, LibreTranslate, Thunderbird and Kooha are listed as working offline. The others need an internet connection for at least some features.
- Which are easiest for beginners?
- Discord, Ferdium and Flameshot are rated beginner-friendly, along with 4 other picks. 3 picks take more time to learn.
- How many free communication apps for Linux are in the directory?
- 20 match: listed under Communication, available on Linux and free to start. This page ranks the top 10 and names up to 20 more under More matches. The Communication category page has every listing, paid ones included.
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