Hula

Hula was a self-contained webmail and calendaring server that focused on getting those two parts right, instead of getting caught up on the Groupware/CSCW quagmire.

It aimed for CalDAV support, for one thing, and that was enough for me to keep track of it. It did not, however, go very far.

• JWZ's essay on Hula - not to be missed, especially if (like me) you were keeping an eye on Collabra products back in the Netscape age.