Communication: this week's most-installed open-source picks
Compare 10 open-source communication apps ranked by real install counts on PickYour.App — specs, pricing and who each tool suits.
If you are shopping for communication software you can actually own, this guide walks the shortlist.
Rather than a flat list, we ranked these 10 tools by how many times people actually started them on PickYour.App.
How they stack up
| # | App | Category | Installs | From |
|---|---|---|---|---|
| 1 | Rocket.Chat Team chat platform you fully control | Communication | 82 000 | €0.046/hr |
| 2 | Mattermost Team chat — the self-hosted Slack | Communication | 78 000 | €0.046/hr |
| 3 | Jitsi Meet Private video meetings in the browser | Communication | 61 000 | €0.046/hr |
| 4 | Postal Self-hosted mail server with a clean sending API | Communication | 42 000 | €0.046/hr |
| 5 | Zulip Threaded team chat for focused teams | Communication | 39 000 | €0.046/hr |
| 6 | Mautic Open-source marketing automation & email campaigns | Communication | 38 000 | €0.046/hr |
| 7 | Synapse Matrix homeserver for private messaging | Communication | 34 000 | €0.046/hr |
| 8 | Listmonk Self-hosted newsletter & mailing | Communication | 33 000 | €0.023/hr |
| 9 | Mailcow Dockerized mail suite with a friendly admin UI | Communication | 29 000 | €0.046/hr |
| 10 | Mailu Simple full-featured mail server in Docker | Communication | 21 000 | €0.046/hr |
What each one is good at
Rocket.Chat
Built around its core job, Rocket.Chat stays out of your way. Plan for 2 vCPU and 4 GB of RAM. It tops the table for a reason: the install flow here is one click, and the first hour costs cents.
Mattermost
Mattermost covers the essentials without demanding a manual. Plan for 2 vCPU and 4 GB of RAM. Close second, and some teams prefer its take on the problem.
Jitsi Meet
The core loop is what Jitsi Meet does best. Spec: 2 vCPU, 4 GB RAM, 25 GB disk. Newer to the catalog, climbing steadily.
Postal
The core loop is what Postal does best. Plan for 2 vCPU and 4 GB of RAM. Lesser known, often a better fit for smaller teams.
Choosing a server
You can try any of them for the price of a coffee per day: Pay as you go works out near €0.046 an hour at full spec, and pausing stops the meter. The install wizard pre-selects the right plan for you.
Generated 2026-10-22 from live catalog data · all guides