Greenspeed recommended products

Magura disc brakes
Hope disc brakes
SRAM components
Sturmey Archer/Sunrace
Shimano components
Arkel pannier bags
Rohloff geared hubs
Busch & Muller lighting systems
Heinzmann hub motors
Primo tyres
Schwalbe tyres
Stan's NoTubes
Sigma cycle computers
Lightspin dynamos
Windwrap fairings
Reflex fairings
BionX hub motors
Schlumpf geared bottom brackets
FastBack hydration systems
TA Specialites cranks, chainrings

Other links of interest and resources

Velovision magazine
Recumbent Cyclist News magazine (RCN)
Recumbent & Tandem Rider magazine
Bent Rider Online
International Human Powered Vehicle Association (IHPVA)
Alternative Technology Association (ATA)
OzHpv
RACV Energy Breakthrough
VicHPV

Some other trike manufacturers for your reference

Inspired Cycle Engineering (ICE)
Catrike
Wizwheels
MR Components
Trisled
Logo Trikes
Windcheetah
Stein Trikes