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OpenSSH for Windows (mls-software) vs PuTTY-CAC: catalog facts
OpenSSH for Windows (mls-software)	PuTTY-CAC
Free Free to download.	Free Free to download from the project's GitHub releases page.
Windows, Command line	Windows
Tracks current OpenSSH releases Builds still available for Windows 2000, XP and 2003	SSH login with smart cards, CAC cards and certificates FIDO key support, including YubiKeys and passkeys
Maintained by a single small site Website is plain and sparse on documentation	Windows only Interface keeps PuTTY's dated configuration dialogs
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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