You can login with your Bitkit wallet now. I'm only about 3 months late delivering this.
Just finished up implementing slashtags auth. Overall pretty good experience. Took a solid day of work - most of which was spent trying to understand it and then situate it in my code. By comparison it took about a half day to do lnurl-auth.
When you're developing locally, the NAT holepunching is great. The documentation needs work but that's to be expected.
Going to review with fresh eyes tomorrow and deploy, then work on Open Timestamps.
Going to try to get OpenTimestamps done today.
edit: I should note we don't support the magic link feature yet ... I will hack that in later. I don't have a generic login token system (current one is deeply baked into email login).