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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.
IRC - Also still around and in some cases, the same as it ever was, albeit with a smaller user base. A list of networks can be found here, and while there are many actively developed IRC clients out there, if you don't know where to start, most people recommend HexChat. Reddit's affiliated network is called Snoonet. mIRC is still actively developed by Khaled Mardam-Bey, so by all means, feel free to give that a shot if you are so inclined.
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.