FIT [L1 ] is a testing framework originally created by Ward Cunningham "specifically applicable to acceptance tests like those prescribed by Extreme Programming." Its home site is a Wiki where its ongoing development continues.
Dave Thomas re-did FIT for Ruby [L2 ]. Lisa Crispin has promised to test a Tcl version, if one of us will just make the time to create it.
In "XP Testing Without XP: Taking Advantage of Agile Testing Practices" [L3 ], Crispin summarizes that "Fit allows you to define acceptance tests as HTML tables ..."