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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Yes, being a GNU project Guix has a strict free software only policy. The biggest channel (repo) with proprietary stuff for Guix is called nonguix. It has the vanilla kernel, Nvidia drivers and a number of other proprietary packages including Steam, Chrome and the like. I don't know what the state of ZFS on Guix is though as I don't care for it myself, but I can see why its inclusion would be questioned with regards to licensing.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.