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Virtual Machine Manager vs Windows (dockur): catalog facts
Virtual Machine Manager	Windows (dockur)
Free Free and open source under the GPL 2.0, maintained by Red Hat.	Free The container is free; Windows licensing is the user's responsibility.
Linux	Linux, Self-hosted
The standard interface for KVM, so guides and answers are everywhere Command line tools for creating and editing machines without a desktop	Automatic Windows download and hands-free installation Near-native speed with KVM acceleration
Linux only The interface is functional and has barely changed in years	Needs a host with KVM support for good performance Windows license terms still apply to the guest
Downloadable app	Self-hosted
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.