While is no longer officially supported by Oracle, you can still find free downloads for the final stable builds through official archives and reputable software repositories. Official Download Links
: Offers VirtualBox 6.0.6 Build 130049; noted as safe and scanned with 70 antivirus apps. FileHippo : Provides VirtualBox 6.0.6 for Mac. advertisement VirtualBox 6 for Mac Free Download
: The older 6.0 branch, which ended support in 2020. Official Old Builds 6.0 Direct Index of 6.0.0 DMG for Mac Alternative Repositories While is no longer officially supported by Oracle,
: The last maintenance release for the 6.1 series. Official Old Builds 6.1 advertisement VirtualBox 6 for Mac Free Download