Mastodon
Alternative to Social network/ Micro-blogging
Federated microblogging server.
Actively maintained
Real momentum
AGPL-3.0
All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon.
Maddy Mail Server is an open-source communication project, with 6.1k GitHub stars and a health score of 52/100. It committed 69 times in the last twelve months across 6 of those months, and its status is actively maintained. Licence: GPL-3.0. It does not currently meet the momentum threshold, so verify maintenance before depending on it.
| Status | Actively maintained — Committed within the last 45 days. |
|---|---|
| Last commit | 2026-07-13 |
| Days since last commit | 35 |
| Commits, last 3 months | 1 |
| Commits, last 12 months | 69 |
| Months with activity | 6 of 12 |
| Last release | 2026-05-23 |
| Archived | No |
| Licence | GPL-3.0 |
| Category | Communication |
Health score combines commit recency, twelve-month commit volume, months with activity, release recency and archive state. Metadata refreshed August 2026.
Copyleft (GPL, AGPL, MPL): derivative work must stay open. AGPL also covers software offered over a network, which blocks most closed SaaS wrappers.
This matters most when you plan to sell a hosted version. A permissive licence means anyone — including a competitor with more capital — can do the same, so your defensibility has to come from distribution, support or data, not from the code.
Maddy Mail Server is not currently shipping at a healthy pace. Popular but stalled projects inflate how competitive a category looks — and they are also risky to build on.
Assume every prospect can find a free version in five minutes. Your wedge has to be something open source structurally cannot deliver: compliance, support SLAs, managed hosting at scale, or a workflow the maintainers refuse to build.
Actively maintained. Maddy Mail Server recorded 69 commits over the last twelve months, with activity in 6 of those months and 1 commits in the last quarter. Last commit: 2026-07-13. Last release: 2026-05-23. Committed within the last 45 days.
Maddy Mail Server is published under GPL-3.0. Copyleft (GPL, AGPL, MPL): derivative work must stay open. AGPL also covers software offered over a network, which blocks most closed SaaS wrappers.
177 open-source implementations, 100 of them actively maintained, led by Mastodon at 50k stars. Saturation score 77/100 — Crowded. Free, maintained alternatives already dominate this category.
Alternative to Social network/ Micro-blogging
Federated microblogging server.
Alternative to Tribe, Circle, Community management
Advanced forum / community solution based on Ruby and JS.
Alternative to Slack, Team communication, Chat & Team Communication
Communications platform that puts data protection first (alternative to Gitter.im and Slack).
Alternative to Courier, MagicBell, Knock, Notification infrastructure, Push notifications
Notification infrastructure for developers.
Communication
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
Alternative to Intercom, Zendesk, Live chat
Customer communication platform (alternative to Intercom and Zendesk).
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