Description:

Skippy is what (I think) is best described as a full-screen
task-switcher for X11. It tries to provide an alternative when
taskbars or regular task-switchers aren't the most efficient way of
switching tasks (like when you have a lot of applications open). When
activated (currently only through a hotkey), it will arrange and scale
snapshots of all windows on the current desktop and it'll let you pick
a window using a mouse or a keyboard. Yes, this is also what expocity
and Apple's Expose do (yeah, I know, Expose does more than just this),
but I don't like metacity (expocity is a 'hacked up' version of that)
and I don't have a Mac.