Colloquium
From ToolCenter
"Colloquium is a webcasting tool developed under the auspices of NITLE in order to facilitate the sharing of teaching resources among NITLE colleges. Using colloquium's streaming audio or video features,
A faculty member can "guest lecture" in a colleague's class on a distant campus without leaving home.
Visiting lecturers can be shared, in terms of both cost and content, among several institutions."