OSS-Finder logoOSSFinder

The Best Open-Source Alternatives to Zendesk

Are you looking for a free or self-hosted alternative to Zendesk? In 2026, avoiding expensive proprietary software subscriptions is easier than ever. The open-source community has built excellent privacy-friendly tools within the Customer Support ecosystem. Currently, there are 8 active replacements available, with Mattermost being one of the most prominent selections.

Quick Comparison: Zendesk vs. Open Source

Full comparison: Zendesk vs. Mattermost →
CriteriaZendeskOSS Replacements
Pricing modelPaid / Monthly Fees100% Free / Self-Hosted
Data ControlThird-party ServersFull Ownership & Privacy
CustomizabilityRestricted by VendorUnlimited (Modify Codebase)

Sort alternatives

Choose the metric that should define the list order.

Mattermost

šŸ“ˆ Trending⭐ 10k+ Stars
NOASSERTION

Mattermost is a flexible, open-source, and highly customizable communication platform that allows teams to collaborate securely and privately via instant messaging, voice calls, video conferencing, and file sharing. As an alternative to Zendesk, Mattermost provides a self-hosted, ad-free, and GDPR-compliant solution for customer support, giving teams greater control over their data while enjoying a seamless user experience.

⭐ 38,628 Stars
šŸ“ 8,870 Forks
ā— 0 Open Issues
šŸ·ļø NOASSERTION
AGPL-3.0

Zammad is a highly customizable, open-source helpdesk software that enables efficient ticket management and customer support, offering an attractive alternative to commercial solutions like Zendesk. Built with a strong focus on data privacy and security, Zammad empowers users to host a reliable, scalable support platform that respects user data and remains under their exclusive control.

⭐ 5,831 Stars
šŸ“ 1,030 Forks
ā— 0 Open Issues
šŸ·ļø AGPL-3.0
AGPL-3.0

SuiteCRM is a comprehensive, open-source customer relationship management (CRM) platform that offers a free, scalable, and customizable alternative to traditional CRM solutions, empowering businesses to streamline sales, marketing, and customer service operations with enhanced data ownership and control. As a Zendesk alternative, SuiteCRM prioritizes user data privacy, providing a secure and private platform that is free from vendor lock-in and data sell-off concerns.

⭐ 5,603 Stars
šŸ“ 2,385 Forks
ā— 0 Open Issues
šŸ·ļø AGPL-3.0
GPL-2.0

osTicket is a free, open-source ticketing system that empowers businesses to manage customer support and internal issues through a customizable, web-based interface, providing a cost-effective and privacy-friendly alternative to commercial solutions like Zendesk. By hosting it on-premises or self-hosting it, users maintain complete control over their data and can adapt the software to meet their specific needs without vendor lock-in.

⭐ 3,863 Stars
šŸ“ 1,830 Forks
ā— 0 Open Issues
šŸ·ļø GPL-2.0

Helpy is a self-hosted, open-source helpdesk software that empowers businesses to effectively manage customer support inquiries while maintaining complete control over their data, unlike commercial alternatives like Zendesk. It offers a robust set of features, including ticketing, automation, and reporting, all within a secure, community-driven platform that prioritizes user data sovereignty.

⭐ 2,481 Stars
šŸ“ 490 Forks
ā— 0 Open Issues
šŸ·ļø MIT
AGPL-3.0

Feng Office is an enterprise-ready, free and open-source workspace application that streamlines customer service management, issue tracking, and team collaboration, offering a secure and customizable alternative to proprietary solutions like Zendesk. This feature-rich platform enables organizations to efficiently handle customer inquiries, while maintaining full control over their data and workflows.

⭐ 106 Stars
šŸ“ 65 Forks
ā— 0 Open Issues
šŸ·ļø AGPL-3.0
Open Source

FusionForge is a powerful, web-based project management and issue tracking platform that empowers teams to collaborate and streamline workflows in a secure and private environment. As a free, open-source alternative to ticketing systems like Zendesk, FusionForge offers unparalleled flexibility, customization, and data control, making it an ideal solution for organizations seeking a private and cost-effective solution.

⭐ 14 Stars
šŸ“ 4 Forks
ā— 0 Open Issues
šŸ·ļø Open Source

Tiki Wiki CMS Groupware is a comprehensive, flexible, and highly customizable all-in-one web application that empowers businesses and communities to create robust knowledge bases, collaborative platforms, and customer support systems while prioritizing user data protection and agency. As a privacy-friendly open-source alternative to Zendesk, Tiki offers self-hosting, total data control, and community-driven development, making it an attractive choice for organizations seeking a secure and sustainable customer support solution.

⭐ 0 Stars
šŸ“ 0 Forks
ā— 0 Open Issues
šŸ·ļø Open Source

Frequently Asked Questions

What is the best open source alternative to Zendesk?

Based on GitHub community data (including star count and fork activity), Mattermost stands out as one of the most reliable open-source replacements for Zendesk today.

Why should I use an open-source replacement instead of Zendesk?

Switching to an open-source solution ensures complete data sovereignty, protects your software environment from sudden vendor price hikes, and gives you full transparent control over your tech-stack metadata.