Vercel Labs' vendor API emulator. It answers as Google, Stripe, Slack, GitHub and a dozen more, which is what lets an app finish its sign-in instead of dying on a 401.
Builds, launches and teardown, so a session that fails to start still gets cleaned up.
And the projects themselves
The largest debt is the catalogue. Every demo here runs software somebody
else wrote, maintains and gives away, from a published image we did not
build. We do not modify it, and a listing is not an endorsement from them
of us.
If you maintain one of them and would rather not be listed,
say so
and it comes down.
We use privacy-friendly analytics to see which demos people try, so we know
what to fix and what to add next. No advertisers, no data selling, no
tracking you across other sites.
How we measure the site