5 best open source antivirus software [Windows 10 & Mac]

Radu Tyrsina
by Radu Tyrsina
Founder & Editor-in-Chief
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  • If you love innovation, then you will most likely not go for a traditional antivirus to protect your system.
  • And that is absolutely fine. Just make sure you pick the best open-source antivirus software out there.
  • Dive deeper into the topic by exploring our Open-source Solutions.
  • Check out our Best Antivirus Hub as well for even more useful tools and tips.
best antivirus with web filtering

Open source antivirus software can detect lots of types of malicious software.

Experienced developers and research experts in the antivirus, network security, and computer security fields will know best the meaning of open-source software.

An open-source antivirus denotes a program for which the original source code is made available for free, and it may be modified and redistributed.

We gathered five of the best programs to make your choice more comfortable.

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Open source antivirus software for Windows PCs

Bullguard

When it comes to trustworthy solutions to quickly detect and neutralize advanced threats, Bullguard is unmatched.

This antivirus may not be the exponential open-source tool since it’s already a well-established, feature-rich security solution, nevertheless, it embodies the scalability and efficiency you could ask from an open-source project.

Plus, it offers a 30-day free trial period to allow you plenty of time to test its features and convince yourself before closing the deal.

Let’s quickly look at its key features:

  • Open-source antivirus with real-time protection through a quick online scanner
  • Resilient and advanced security
  • Extensive Parental Control options to monitor online activity and block inappropriate content and apps
  • Behavioral Engine and advanced machine learning
  • Integrated Vulnerability scanner and firewall
  • Cloud integrated backup
Bullguard

Bullguard

Get premium, real-time protection powered by BullGuard for all OS versions.

Check out the full Bullguard review here


This is an open-source antivirus for servers and PCs that protects systems from any viruses and malware.

The solution is, of course, available for Windows machines and it is created with a web-based central administration console.

The software can be used remotely from any location via an intuitive interface, and it will provide access to lots of features.


Need an antivirus with low resource consumption? Check out our best picks in this article.


Let’s quickly look at its key features:

  • Traditional signature-based malware detection (ClamAV signatures and YARA rules support)
  • Innovative heuristic detection modules for binaries and PDF documents
  • Real-time protection (quarantine specific zones, provides alerts transmission and events journal)
  • Modular architecture (to easily integrate the newest detection algorithms)
  • Open-source solution (allows third-parties to review the codes and eliminate development flaws)
  • User-friendly interface (secure setup and functions that will allow you to check your machine’s and server’s status instantly)
  • Comprehensive dashboard (on-demand scanning, real-time protection, threat detection journal, technical support and more)

Check out all features of Armadito Antivirus

This is another open-source antivirus software that includes more projects available for developers who wish to add their contributions and improve it.

OpenAntiVirus Project is based on the fact that successful open-source software provides enhanced portability, scalability, reliability, and effectiveness.

This is a platform for people who are really interested and enthusiastic about antivirus research, computer, and network security.

You will be able to use an integrative platform for various developing projects that are related to virus protection and computer security.

Let’s quickly look at its key features:

  • Includes VirusHammer (standalone virus scanner that is supposed to be run by end-users)
  • ScannerDaemon, and PatternFinder and more tools that provide antivirus protection
  • Squid-v scan (to scan all traffic that is going through the famous Squid HTTP-Proxy for known malware and viruses)

Check out all features of OpenAntiVirus

ClamAV is another open-source antivirus engine targeted at detecting viruses, Trojans, malware and other kinds of malicious threats.


Take a look at the best antimalware tools for Windows 10 in this useful article.


Let’s quickly look at its key features:

  • The open-source standard for mail gateway scanning programs
  • Includes a multi-threaded scanner daemon and command-line utilities for on-demand file scanning and also for automatic signature updates
  • Supports various file formats, file and archive unpacking, and various signature languages
  • Suitable for web scanning, email scanning, and endpoint security as well
  • The virus database is updated multiple times a day.

Check out all features of ClamAV

ClamWin is a free antirust software for Windows, and the program is being used by more than 600,000 users worldwide on a daily basis. It includes an easy installer and open source code.


Need an anti-hacking software tool to stay protected? Check out our top picks.


Let’s quickly look at its key features:

  • High detection rates for viruses and spyware
  • Includes a scanning scheduler, standalone virus scanner, and right-click menu integration to Microsoft File Explorer
  • Automatic downloads of regularly updated Virus Database
  • Add-on is available for Microsoft Outlook (removes virus-infected attachments instantly and automatically)

Note: ClamWin Free Antivirus doesn’t come with an on-access real-time scanner. This means that you will need to manually scan a file in order to find a virus or potential spyware.

Check out all features of ClamWin


These are some of the best open-source antivirus programs that you can currently find out there.

All of them are great, offering robust sets of useful features and you can go for each one.

If you have any other suggestions for this list, don’t hesitate to leave them in the comments section below.

FAQ: Learn more about open-source antiviruses

  • Is there any open source antivirus?

Yes, there are quite a few solutions available. Check out this complete list and compare available features before making a decision.

  • Is Clamav a good antivirus?

Yes, ClamAV is the open-source standard program including a multi-threaded scanner tool, on-demand file scanning, and automatic signature updates.

  • How good is ClamWin antivirus?

This is a great open-source alternative for beginners as it has a digestible open-source code and it can be easily installed and set up.

Editor’s Note: This post was originally published in January 2018 and has been since revamped and updated in June 2020 for freshness, accuracy, and comprehensiveness.