osTicket
The osTicket open source ticketing system official project repository, for versions 1.8 and later (by osTicket)
Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.. (by mattermost)
osTicket | Mattermost | |
---|---|---|
69 | 166 | |
3,450 | 33,071 | |
1.1% | 1.2% | |
8.4 | 10.0 | |
5 months ago | 5 days ago | |
PHP | TypeScript | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
osTicket
Posts with mentions or reviews of osTicket.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-05-19.
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6 Best Open-Source Ticketing Systems for 2025
🔗 GitHub: https://github.com/osTicket/osTicket
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The 50 best open-source alternatives to popular SaaS software
GitHub: osTicket GitHub Repository
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List of your reverse proxied services
OsTicket as Ticket System
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Ask HN: Helpdesk/ticketing software for small SaaS company
You can try osTicket https://osticket.com
The UI is very tho dated, but we're working on a rewrite with modern UI.
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Looking for a ticketing system
Check out https://osticket.com/ I used earlier on my career. It’s free to use it worked great for a small team and it has everything you need.
- Affordable multi channel support ?
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Help tickets
we use https://osticket.com/ It's not a groundbreaking ticket system but it's rock solid, user-friendly, and free.
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I would like to find a free software for tickets in my household
Another option, for a dedicated ticketing/helpdesk system, is osTicket. Self-hosted is completely free, and I had it up and running inside of an hour, from creating a fresh Debian LXC, installing Apache/MariaDB/PHP8.1, and uploading the requisite files for osTicket followed by the initial setup. Going off your mention of snaps, I'm assuming you're on Ubuntu or a derivative, if you'd like I should be able to write up a quick guide for installing osTicket specifically for whatever version of Ubuntu you're on, cause at least on Debian I had to go track down the requisite PHP version.
- Tailor, Cobbler, Repair Ticketing System Recommendations
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MSP opensource ticketing tool -ITSM
GLPI (https://glpi-project.org/) or osTicket (https://osticket.com/) are open source ticketing systems but I highly doubt they're what a MSP need. You need a PSA.
Mattermost
Posts with mentions or reviews of Mattermost.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-05-04.
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Indie Hacking with Open Source Tools: Innovating on a Budget
Indie hackers also leverage collaboration tools like Nextcloud for file sharing and team projects, and Mattermost or Rocket.Chat as self-hosted alternatives to Slack. These tools empower remote teams and foster efficient communication across diverse development projects.
Communication tools such as Mattermost and Rocket.Chat support team collaboration.
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Revolt: Open-Source Alternative to Discord
Golang would have encouraged a lot more contributions, e.g. https://github.com/mattermost/mattermost (I am not affiliated with them).
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Indie Hacking Success Stories with Open Source Licenses
Mattermost: For teams seeking a secure, self-hosted communication solution, Mattermost stands as a beacon of open source excellence. With a foundation built on the MIT License, Mattermost caters to organizations that prioritize data security and customization. Its growth not only reflects a need for privacy in digital communication but also showcases how open source frameworks support tailored solutions.
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Reviving An Outdated Project
[GH-29548] Avoid SELECT * in `tokens_store.go` #29558
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Campsite/Campsite: The Campsite Monorepo
Is there an 'open source Slack' type thing anywhere?
This is the closest I've found- https://mattermost.com/
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My Goals Working On Open Source
So far I think I've been doing pretty well. While the scope of my contributions has varied, I've been able to work on a few projects - some larger than others, but all of them being software that people actually use (as opposed to someone's side project): cve-bin-tool, libplanet, ByteChef, Ghostfolio, and Mattermost.
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Doing More Open Source Stuff: Making Up For Lost Time
Add timestamp to pasted image filenames to differentiate them #29524
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From Idea to Startup: How Open Source Tools Can Help You with Setting up Your Business
Star Mattermost⭐
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Contributing to Mattermost - I said ":D", not "😄"
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React and runs as a single Linux binary with MySQL or PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
What are some alternatives?
When comparing osTicket and Mattermost you can also consider the following projects:
Zammad - Zammad is a web based open source helpdesk/customer support system
Synapse - Synapse: Matrix homeserver written in Python/Twisted.
FreeScout - FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)
Rocket.Chat - The communications platform that puts data protection first.
Request Tracker - Request Tracker, an enterprise-grade issue tracking system
Zulip - Zulip server and web application. Open-source team chat that helps teams stay productive and focused.