It is quite hard to distinguish between well-known trackers and the not-so-well-known trackers, mainly because we listened and/or collected these modules from 1990 onwards or watched the productions shortly after release. Where most of my mates were copying games, I was buying stuff off PD houses and swapping disks with people with scene stuff on them. It's very hard to see most trackers as not-so-well-known.
As an example, how many of these haven't you heard of before?
/rcg on
Baby
Blue Fox
Dice (Tivurr)
Dr Bully
Fajser
Gandbox
MC Spicy
Mindfuck
Mr Man
Nork
Nutcase
Randall
Silent Mode
Stamen
X-ceed
Zbb
Zixaq
/rcg off
There are countless others who I could have mentioned. Even Yannis is pretty much as well-known as Moby, Jester, Purple Motion, Jogeir, Skaven and many others. I suppose the only ones would have been the one mod release and uncredited modules and I have plenty of them!!

All those listed above, although not that well known have plenty of great tunes amongst their releases, but few of them hardly ever get a mention.