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Open-source IT service management (ITSM) and PSA tools in 2026

5 open-source projects, ranked by GitHub stars and how recently each was worked on. GLPI leads with 6.5k stars, ahead of iTop. 5 had code pushed in the last three months. Most common licenses: GPL-3.0 (3), AGPL-3.0 (1) and MIT (1). Commercial IT service management (ITSM) and PSA tools are listed separately.

All open-source IT service management (ITSM) and PSA tools, ranked

Complete systems you can adopt 5

  1. 1
    GLPI glpi-project

    GLPI is a Free Asset and IT Management Software package, Data center management, ITIL Service Desk, licenses tracking and software auditing.

    Complete system Production-ready An IT department wants a free, self-hosted helpdesk and asset register and is comfortable with a PHP application.

    ★ 6.5k GPL-3.0 PHP Active, pushed yesterday
  2. 2
    iTop Combodo

    A simple, web based CMDB & IT Service Management tool

    Complete system Production-ready You need ITIL processes tied to a data model you can reshape, and want an open-source product with a commercial vendor behind it.

    ★ 1.2k AGPL-3.0 PHP Active, pushed today
  3. 3
    ITFlow itflow-org

    All in One PSA for MSPs, which Unifies client, contact, vendor, asset, license, domain, ssl certificate, password, documentation, file, network and location management with ticketing and billing capabilities, with a client portal on the side.

    Complete system Usable A small MSP wants one self-hosted tool for tickets, client documentation and billing instead of several subscriptions.

    ★ 1k GPL-3.0 PHP Active, pushed 4 days ago
  4. 4
    Znuny znuny

    Znuny is a free, open-source, and versatile web-based ticketing system for Customer Service, Help Desk, IT Service Management, and more. It is built for transparency and long-term sustainability and is highly tailorable to your organization's needs.

    Complete system Production-ready You run OTRS Community or want its process-heavy ticketing without a licence fee.

    ★ 611 GPL-3.0 Perl Active, pushed 4 days ago
  5. 5
    FreeITSM edmozley

    A completely free ITSM tool

    Complete system Experimental A small UK-style IT team wants a no-per-seat helpdesk on a plain PHP and MySQL server.

    ★ 119 MIT PHP Active, pushed yesterday

Compared head to head

Jira Service Management vs ServiceNow IT Service ManagementManageEngine ServiceDesk Plus vs ServiceNow IT Service ManagementGLPI vs ServiceNow IT Service ManagementiTop vs ServiceNow IT Service ManagementITFlow vs ServiceNow IT Service ManagementJira Service Management vs ManageEngine ServiceDesk PlusGLPI vs Jira Service ManagementiTop vs Jira Service ManagementITFlow vs Jira Service ManagementGLPI vs ManageEngine ServiceDesk PlusiTop vs ManageEngine ServiceDesk PlusITFlow vs ManageEngine ServiceDesk PlusGLPI vs iTopGLPI vs ITFlowITFlow vs iTop

Also under help desk and ticketing software

Live chat and customer messaging tools

Open-source licenses

  • Strong copyleft: 3. If you distribute the program or anything built on it, you must release the whole source under the same license.
  • Network copyleft: 1. Like GPL, and running a changed version as a web service counts as distributing it, so its users get the source too.
  • Permissive: 1. Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights.

Languages

PHP 4 and Perl 1.

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