The Park BBT-2 fits both Octalink and ISIS bottom brackets so the Nashbar tool should also.
ISIS is an acronym for "International Spline Interface Standard." It is a public domain design intended to provide a splined crank interface like Shimano's patented Octalink but not require a license from Shimano. I also pronounce it as a word (Eye Siss) but it originated as an acronym.
For those who really want the minutae of the ISIS design, here is a .pdf giving all of the gory dertails:
http://www.isisdrive.com/isisdrive/I...ument_revD.pdf