The best open source alternative to Malwarebytes Anti-Malware is ClamAV. If that doesn't suit you, our users have ranked more than 100 alternatives to Malwarebytes Anti-Malware and 15 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Malwarebytes Anti-Malware are Tron Script, ClamTk, ClamWin and LoveLaceAV.
Malwarebytes Anti-Malware alternatives are mainly Anti-Virus Apps, but if you're looking for
Anti-Malware Apps or System Cleaners you can filter on that. Other popular filters include
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EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Malwarebytes Anti-Malware.