Based on our record, OpenID Connect Playground seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I too found this hard to reason, but figured it out: If you're demoing using https://openidconnect.net for example, set your Client ID to https://openidconnect.net Likewise, your ClientID should match the id of the website your are using this on. This was mentioned in the GitHub readme too but didn't click until trying the demo. - Source: Hacker News / 7 months ago
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PropelAuth - PropelAuth hosts and manages your authentication.
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Smallstep SSH - Single Sign-on SSH