In the N2S3 project we use a mailing list for communication. Maybe old-fashioned, but asynchronous, and who does not have a mail client?
Subscribe to the mailing list using the following link
This mailing list is public to everyone that subscribes.
Please remark that the list is moderated to avoid off-topic messages. Authorized messages:
Please, be polite to everyone in the list. Spam and off-topic messages will be rejected automatically.