Service Desk
4 open source tools compared. Sorted by stars. Scroll down for our analysis.
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
| Tool | Stars | Velocity | Score |
|---|---|---|---|
 UVdesk UVdesk Open Source Community Helpdesk is a comprehensive ticketing support system designed for everyone, offering robust features to streamline customer support and collaboration. | 19.5k | - | 61 |
 Zammad Zammad is a web based open source helpdesk/customer support system. | 5.8k | +16/wk | 74 |
 FreeScout FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative) | 4.5k | +8/wk | 64 |
 osTicket The osTicket open source ticketing system official project repository, for versions 1.8 and later | 3.9k | - | 62 |
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Our Analysis
UVdesk is a Symfony-based helpdesk aimed at e-commerce support, with marketplace connectors rather than just an email inbox. The community edition is self-hosted and free forever with unlimited agents, which is unusual in a market that charges by the seat. Running it means PHP, Symfony and MySQL. Heavier to stand up than osTicket, lighter to keep running than Zammad. The marketplace integrations are the real differentiator: if your support volume arrives from storefronts rather than a support address, that shapes the whole workflow. Hosted plans start at $22/mo for two agents with extra agents at $11/mo, and the Pro tier at $36/mo adds unlimited mailboxes and a knowledge base. Solo and small teams: self-host, unlimited agents at zero cost is difficult to argue with. Large teams: price the hosted tier against your own ops time honestly. The catch is the license. UVdesk ships under OSL-3.0, which is OSI-approved but unusual and more restrictive than it first appears. Read it properly before embedding this in anything you intend to resell.
Zammad is a web-based helpdesk and ticketing system. Email, chat, social media, and phone calls all land in one unified inbox. Agents can see conversation history, leave internal notes, and escalate tickets through SLA-aware workflows. GPL-licensed, free to self-host. Rails app with Elasticsearch for full-text search. Docker-based deployment is the recommended path. You need Elasticsearch running alongside it, which adds to the resource footprint. Plan for a dedicated server with 4GB+ RAM for any real usage. Active development with regular releases. Support teams canceling Zendesk or Freshdesk can land most of the core workflows here. The interface is not quite as polished but it is genuinely functional. Covers ticket queues, SLAs, customer history, and basic automation rules. The catch: no native live chat widget. You can integrate third-party chat but it is not seamless. And the mobile app is an afterthought compared to Zendesk's.
FreeScout is a self-hosted help desk and shared inbox that directly replaces Zendesk or Help Scout. The core gives you unlimited users, unlimited tickets, unlimited mailboxes, email integration, collision detection, auto-reply, internal notes, and a mobile-friendly interface. All free. Runs on PHP 7.1+ with a standard web server. Lightweight by design, so it works on cheap VPS instances. Updates are handled through a built-in web updater. The base install is simple, but advanced features come through paid modules (lifetime licenses, not subscriptions). Solo support reps and small teams get a complete help desk for free. Paid modules add things like Slack integration, knowledge base, tags, and LDAP. Each module is a one-time purchase, which keeps long-term costs low compared to per-seat SaaS pricing. The catch: the module ecosystem is where they make money. The free core is genuinely useful, but you will likely want 3-5 paid modules to match what Zendesk includes by default. Budget $200-400 one-time for a fully equipped instance.
osTicket has been running support queues since before most helpdesk SaaS existed, and it still does the core job: email to ticket, queues, agent assignment, canned responses and SLA timers. The self-hosted version is GPL and free with no agent limit. It runs on PHP and MySQL and the install is genuinely simple, which is most of its appeal. The interface looks like 2010, and that will matter more to some teams than others. A hosted option, SupportSystem, is sold separately by the same team for anyone who would rather not run it. The absence of a per-agent charge is the real story. Commercial helpdesks bill roughly $20 to $100 per agent per month, so a ten-person support team is looking at meaningful money saved every year. Solo and small teams: this is the pragmatic pick. The catch is that osTicket shows its age nearly everywhere. Zammad and FreeScout are both better maintained and better looking, and Zammad handles internal service desk work more convincingly if that is what you actually need.