ZTFY is built on top of ztk by Theirry. It supports a rich ZMI, but he stops short of TTW development. His technical support is brilliant.
His knowledge is fantastic. But sadly, AFAIK, no one else is using his packages. But there is some great software in there.
This is the main site for ztfy. Look at the great article on using zeo in a geographically distributed fashion.
I invite you to Register and then link to your own blog postings and