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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.
I think it’s the best for Go because it manages to bring a very easy to use API and still allow for a lot of flexibility. Your app will run on all major desktop operating systems (even NetBSD and OpenBSD with the upcoming release) but also on mobiles. It doesn’t suffer from the same issues that bindings to C-libraries (like GTK and Qt) have and is also super easy to cross-compile using https://github.com/fyne-io/fyne-cross.
Well, it's good enough that Tailscale picked it for this (apparently): https://play.google.com/store/apps/details?id=com.tailscale.ipn