Best Open Source Operating Systems 2026

Operating Systems

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Browse free open source Operating Systems and projects below. Use the toggles on the left to filter open source Operating Systems by OS, license, language, programming language, and project status.

Free and Open Source HR Software
OrangeHRM provides a world-class HRIS experience and offers everything you and your team need to be that HR hero you know that you are.

Give your HR team the tools they need to streamline administrative tasks, support employees, and make informed decisions with the OrangeHRM free and open source HR software.

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Entity Management Software
Filejet’s entity management software organizes & files all of your entity reports: every year, in every jurisdiction – with total visibility.

Automate everything: entity compliance, registered agent services, annual report and BOI filings, org charts, and DBA/fictitious name and business registration renewals, so you can focus on higher-value work.

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1

Robolinux

Announcing Robolinux Cinnamon 14.1

Announcing The New Robolinux Series 14 Mate LTS - 2034 Robolinux is very pleased to announce a completely new 14.1 Mate privacy centered 1inux operating system you can download freely while also offering our users an optional 14+ advanced upgrade which comes with our Untracker and FAAST Boot along with one click popular privacy software installers like Tor and I2p, Wireshark and Bleachbit plus many more for a fair and reasonable price. Robolinux14.1-Mate is ideal for beginners and advanced users. We are proud that it comes with Enoch AI which is TOTALLY 100% PRIVATE, FREE, HONEST & UNCENSORED built into Robolinux Cinnamon 14.1 The Robolinux 14.1 version with rock solid Long Term Support through 2034! requires users to set secure boot in their BIOS. It is currently available in the Cinnamon desktop flavor. we will release series 14 Xfce version in the next two months.For more information please see Readme file. Warmest regards John Martinson Robolinux.org

6 Reviews

Downloads: 111 This Week

Last Update: 2025-10-04
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2

IPCop Firewall

Linux firewall distribution geared towards home and SOHO users.

The IPCop Firewall is a Linux firewall distribution. It is geared towards home and SOHO users. The IPCop web-interface is very user-friendly and makes usage easy.

66 Reviews

Downloads: 59 This Week

Last Update: 2018-09-04
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3

GTCop

GTCop Professional Security Appliance aims to provide a powerful tool for satellite communications, with enhanced QoS and bandwidth controls. As derived from IPCop Firewall, it is a stable, secure, easy to configure and maintain GNU/Linux firewall box.

Downloads: 0 This Week

Last Update: 2013-03-26
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4

SME Server

The Koozali SME Server is a simple and robust server gateway for SOHO

The Koozali SME Server is the open source community side of the original e-smith server. SME Server consists of a modified Red Hat / CentOS Linux installation, together with a number of server applications as well as the server management web panel. Its strengths are its ease to use for anyone able to use a web interface, and its robustness, giving the ability to recover its initial state even after any upgrade. The server is designed for Small Offices and Home Offices to act as a gateway with a firewall web and email services, but fits also home user needs or even the needs as a simple and robust server only in the cloud to host your website projects and emails.

2 Reviews

Downloads: 0 This Week

Last Update: 2017-11-14
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DDoS Protection Solution | A10 Networks
For enterprise IT security teams and network administrators looking to safeguard their networks against the latest and more severe DDoS threats

The standalone SaaS-based DDoS intelligence solution proactively combats the increasing volume and complexity of DDoS threats, reducing operational costs and improving DDoS detection while safeguarding system availability— no dedicated DDoS equipment needed.

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