Get in touch
There is a public mailing list with the address firstname.lastname@example.org. Your first email to this address will be considered a subscription request, any following email will reach the LibertyEiffel team and other users. An online archive is also available to browse old messages.
IRC is realtime chat and from time to time you'll find some of Liberty developers or users in the channel #liberty-eiffel on the freenode network. If you do not have an IRC client handy you could give the webchat interface a try.
Github issue tracker
If you just want to issue a bug report or feature request, feel free to enter it in the issue tracker on github.