One of the most difficult things about getting people into a group-collaboration system is that most people resist adopting a new system. Tgethr circumvents that problem by using email as a core hub, while still offering advanced collaborative tools.
Once you sign up for an account, you can create a custom email address at Tgether for everyone to keep in the loop, such as [email protected] From there you can invite people, via email, to participate in your discussion group. They won't need to log in or do anything other than continue using their email as they are accustomed to. Messages are routed through the Tgether server where they are archived—along with email attachments—and accessible via the web for future use.
People in your group who are comfortable using the web interface can jump in, and those who prefer to stick to only using email can continue to do so. Tgether has tiered plans starting with a free plan for individuals and moving up to a fairly extensive plan with multiple groups and online storage for companies.