Odyssey Writers Workshop
Jeanne Cavelos, director of Odyssey, notes that Odyssey is also a six week workshop, like Clarions East and West. Odyssey is not specifically oriented to SF, where both Clarions are. Odyssey has the same instructor pretty much throughout, where Clarions East and West offer one instructor per week, except the last two weeks, where two writers are available.
The main feature: Odyssey is the only workshop of its kind run by an editor.