MelloSound

A very nice instrument -- what could be better than a free mellotron? While it doesn't go so far as M-tron in striving for the perfect emulation, it does offer an identifiable "mellotron" sound.
UI -- nice & small with no unnecessary bells & whistles, nice mellotron-style dials
sound -- pretty much described above
features -- only three sounds (but look at a real mellotron). Control over tone and attack & decay (I don't *think* the mellotron had these) and a "quality" control for that classic crappy tape sound :)
docs -- none
presets -- bare bones
support -- never needed
vfm -- 10 of course
stability -- no problems here