Get in touch
There is a public mailing list with the address firstname.lastname@example.org. To subscribe please visit the subscription formular or send an email. An online archive is also available to browse old messages.
IRC is a realtime chat protocol and from time to time you'll find some of Liberty's developers or users on the #liberty-eiffel channel hosted by the freenode network. If you do not have an IRC client handy you could give the webchat interface a try.