Psion Teklogix
Offers bar code scanner/readers, speech recognition, vehicle computers, handheld computers, mobile ruggedized computers and RFID solutions for rugged and harsh environments.
http://www.psionteklogix.com

Quartus Handheld Software
Compilers, applications and other productivity enhancement software for Palm, PalmPilot, daVinci, Visor, and other handheld computers. Drop by the discussion forum!
http://www.quartus.net/

Time Collection for legal markets
Products include Distributed Time Entry (DTE), available in versions for desktop computers, the Web, SQL, and handheld computers.
http://www.aps-soft.com/

Delkin Devices, Inc.
Delkin Devices manufactures Compact Flash UDMA digital camera accessories including: batteries, memory cards, readers, adapters, Pop-Up Shades, Archival Gold CD/DVD’s, DVD Burnaway, SensorScope DSLR sensor cleaning, Snug-it camera skins. Delkin’s OEM division manufactures embedded flash memory boards and solid state drives.
http://www.delkin.com/

New Micros, Inc.
Designs, builds: single board computers (SBC), peripherals, embedded systems, PCB design/layout, high level programming (industry leaders in Forth), custom design work; large line of stock products: from full handheld computers to development packages. Since 1980.
http://www.newmicros.com/

Whatlaptop & Handheld PC
The leading resource for Laptop news and reviews.
http://www.whatlaptop.co.uk

Doctors Gadgets
Articles and resources about handheld computers used in medicine.
http://www.doctorsgadgets.com/

Pocket Systems Ltd.
PocketGIS - a Geographical Information System for handheld and tablet computers.
http://www.pocket.co.uk/

ZiPCAD
ZiPCAD is a full featured CAD program for Palm Handhelds; complete with lines, arcs, trim functions, grouping, infininite undo....more than 60 features in all.
http://www.zipcad.com/

StarTrak
Freeware for Psion handhelds to help you find and track objects of the night sky. Well suited to Dobsonians.
http://www.startrak.co.uk/