For Unix guru's only

Well I thought Unix conferencing software would make a good topic for discussion.
Which one is the most advanced, easiest to learn for user, and some of it's advanced features.

Mine is PicoSpan, cause it's the first one I ever use and love the experience it was easy to learn and to customize. What do the God's and Goddess's here on AO favor of for as conferencing software goesand why, what are some of it advance features. Is one more secure than the other if so which one.

Ahhh...::coffee::....Unix:jams:

-If U don't understand-
Remember the topic.