I tend to share https://nohello.net/. It may be newer, but it's also open source, is available in multiple languages, emphasizes asynchronous communication [1][2], and uses _The Office_ as its setting which makes sharing it a bit more lighthearted.

[1]: https://en.wikipedia.org/wiki/Asynchronous_communication#Ele...

[2]: https://async.twist.com/asynchronous-communication/