Who are the most underground high-end companies

Are you looking for a list of obscure high-end companies or high end companies that make what we think are good components and should be recognized?

For just speaker drivers and components, I would elect, among the rarest:

Goto
ALE
Cogent
G.I.P. Labs

For tube electronics (amps, DACs):

Audio Note
Kondo
Aldo D'Urso

For more sensibly priced stuff:

Synthesis (amps, dacs)
Vinnie Rossi (integrated amps with everything built in)
Lavardin (integrated amps)
LFD (integrated amps)
Trenner & Friedl (speakers)

When searching gear often the name Sugden comes up . Typically from posts from people in Europe . Audio Analogue as well 

Continuum Audio Labs (Caliburn turntable, $100K)
DarTZeel (you know, the guys with the $112k amplifier)
David Berning Company
BWS Consulting
TG Audio
Raidho
Lessloss
Acoustic Revive
Furutech

Belles
Audio by Van Alstine
Audible Illusions