The project is coordinated though the general mailing list which you can subscribe to following this link:
To contact us subscribe to this mailing list, or just email freepto [at] autistici [dot] org.
For quick messages, reports or simple support requests, you can find us on our IRC channel, using this data:
Server address ai.irc.mufhd0.net (or: wi7qkxyrdpu5cmvr.onion)
SSL user port 9999
SSL CA: ca.autistici.org