Free Open Source Help Desk Software

What Free Actually Means in Open Source

The word "free" in open source software has two meanings that often get conflated. Free as in freedom means you can view, modify, and redistribute the source code under the terms of the license. Free as in cost means you pay nothing to use the software. Most open source help desks are free in both senses, but the details matter.

Some projects release a "community edition" with limited features alongside a paid "enterprise edition" with the full feature set. This is the open-core model. The community edition is genuinely free and open source, but certain capabilities, like advanced reporting, SSO, or premium integrations, require the paid version. This is a legitimate business model that funds ongoing development, but it means you need to check whether the features you need are in the free tier or the paid tier before committing.

Other projects are fully open source with no paid edition at all. Every feature in the codebase is available to everyone. These projects typically fund development through donations, consulting services, or hosted SaaS offerings that use the same open source code but save you the work of managing the server.

The real cost of free software is not the license; it is the time and infrastructure needed to run it. You need a server (starting at $4 to $6 per month for a basic VPS), time to install and configure the software, and ongoing effort to maintain it. For most teams, this total cost is dramatically lower than SaaS alternatives, but it is not zero, and pretending otherwise leads to poor planning.

Fully Free Platforms (No Paid Tier)

osTicket Community

osTicket's community edition includes every feature in the platform: email piping, ticket routing, custom forms, SLA management, a customer portal, knowledge base, and the full plugin system. There is no enterprise edition with gated features. The only paid option is osTicket's cloud-hosted version, which uses the same code but saves you from managing the server. If you self-host, you get the complete application at no cost.

osTicket is licensed under GPL v2, which means you can modify it freely for your own use. The plugin ecosystem is entirely community-driven, with free plugins covering LDAP authentication, two-factor login, S3 attachment storage, and more. The platform has been free and fully featured since 2003, with no indication that this model will change.

Zammad Community

Zammad distributes its complete platform under the AGPL v3 license. Every feature, including omnichannel support, the built-in knowledge base, LDAP integration, time tracking, and advanced reporting, is available in the free self-hosted version. Zammad GmbH offers paid hosted plans and commercial support contracts, but the self-hosted community edition is not limited in any way.

This is notable because Zammad is the most feature-rich option on this list. Getting omnichannel support with email, phone, chat, Twitter, Facebook, and Telegram integration for free is exceptional. The only cost is the infrastructure to run it, which requires more resources than PHP-based alternatives due to the Elasticsearch and PostgreSQL dependencies.

Request Tracker (RT)

Request Tracker is a Perl-based ticketing system that has been in continuous development since 1996, making it one of the oldest active open source projects in any category. It is licensed under GPL v2 and fully free to use. RT handles complex workflows with custom fields, lifecycle management, approval chains, and asset tracking. Best Practice Solutions (now part of HashiCorp) offers commercial support, but the software itself has no paid tier or feature restrictions.

RT's strength is its extreme flexibility. It can model almost any ticketing workflow, no matter how complex. The trade-off is a steep learning curve and an interface that prioritizes function over form. RT is best suited for IT teams and technical organizations that need workflow capabilities beyond what other platforms offer and have the staff to configure and maintain it.

Peppermint

Peppermint is a lightweight, modern help desk built on Node.js. It is fully open source under the AGPL v3 license with no paid edition. The feature set is intentionally minimal: ticket management, email integration, a client portal, and basic reporting. The Docker-based installation takes minutes, and the application runs with very low resource overhead.

Peppermint targets small teams that want the simplest possible setup without the configuration depth of osTicket or the infrastructure requirements of Zammad. It is a good fit for internal IT support at small companies or as a lightweight helpdesk for a side project. It is not designed for large-scale customer support operations.

Open-Core Platforms (Free Base, Paid Extras)

FreeScout

FreeScout's core is open source under the AGPL v3 license, and the base application is genuinely capable: multiple mailboxes, conversation management, collision detection, saved replies, custom fields, and customer satisfaction surveys. The free community modules add Telegram integration, custom notification channels, and other useful features.

Where FreeScout enters paid territory is its official module marketplace. Modules for knowledge base, Slack integration, webhooks, custom OAuth, WhatsApp, and advanced reporting are paid, typically priced as one-time purchases rather than subscriptions. Individual modules range from $10 to $50, and a bundle with all official modules costs around $300. This is still dramatically cheaper than SaaS alternatives, but it means the "free" version of FreeScout does not include every feature the platform is capable of.

For many teams, the free core is sufficient. If you only need email-based support with basic conversation management, FreeScout's free version delivers that fully. The paid modules become relevant when you need specific integrations or a customer-facing knowledge base.

UVdesk Community Edition

UVdesk releases its community edition under the MIT license, which is one of the most permissive open source licenses available. The free version includes unlimited agents, workflow automation, a knowledge base, multi-channel support, and the form builder. E-commerce integrations for Shopify and Magento are also available in the community edition.

The paid enterprise edition adds features like social media channel integration, advanced SLA management, and priority support. For most e-commerce support operations, the community edition covers the essential needs. The unlimited agent count alone sets UVdesk apart from SaaS platforms that charge $20 to $50 per agent per month.

Faveo Helpdesk

Faveo Helpdesk offers a community edition built on Laravel, licensed under the OSL 3.0 license. The free version includes email ticketing, a knowledge base, SLA management, and basic reporting. The paid editions add features like asset management, multiple company support, advanced automation, and priority technical support.

Faveo's interface is modern and clean, making it approachable for non-technical users. The community edition is a reasonable starting point for small teams, though the feature gap between free and paid is wider than with osTicket or Zammad, where the free version contains everything.

GLPI

GLPI is an IT Service Management tool that combines a help desk with asset management, network inventory, and a configuration management database. It is fully open source under GPL v3, but the project's company, Teclib, sells commercial plugins for features like advanced dashboards, form creation, and data injection. The core application is comprehensive for ITSM use cases, and many organizations use it without any paid plugins.

GLPI is not a customer support help desk. It is designed for internal IT teams that need to track both support tickets and physical/virtual assets in a single system. If your primary need is external customer support, look at osTicket, FreeScout, or Zammad instead. If you need IT asset management alongside ticketing, GLPI is the strongest free option.

The Real Cost Breakdown

Here is what self-hosting a free help desk actually costs per month for a typical small to medium team:

Compare this to Zendesk at $55 to $115 per agent per month, or Freshdesk at $15 to $79 per agent per month, and the savings are obvious. A team of 10 agents saves $6,000 to $13,000 per year by self-hosting osTicket instead of using Zendesk's professional plan. Even Zammad's higher infrastructure costs result in massive savings compared to SaaS alternatives.