Gack-Apps
- Palm OS application development with a showcase of shareware applicationss.
- http://www.gack-apps.com/

On Duty Technology
- Specializes in creating Palm software for firefighters and other public safety personnel. Products include Hydro, a hydraulics calculator for firefighters and Shiftcal, a shift calendar for firefighters.
- http://www.ondutytech.com/

DDH PalmPilot Software
- Custom software for the Palm OS as well as Win95/98/NT from the creator of HanDBase, and Thesaurus.
- http://www.ddhsoftware.com/

Stevens Creek Software
- Custom Palm software development from the creators of PalmPrint and the winner of the 1999 programming contest at Palm Developer's Conference.
- http://www.stevenscreek.com/pilot/custom.html

Green Mountain Software
- A small "boutique" custom development shop specializing in vertical market applications for Palm Pilot, Windows CE and Newton platforms (and corresponding Windows 95/NT applications).
- http://www.gmsw.com/

Land-J Technologies
- Custom software solutions for the Palm OS from the makers of JFile, the award-winning Palm database application.
- http://www.land-j.com/custom.html

Pen Computer Solutions
- Designs, programs and integrates custom software applications for all Palm OS and Pocket PC PDAs.
- http://www.pencomputersolutions.com/