The Psionics Files  
   A project for collating information about programming the Psion Series 3 and 3a which is not in the manuals provided with the machines.
   http://www.davros.org/psion/psionics/

Konstantin Saliy  
   Software for the S3a, programmers' FAQ and a Russian Psion page (Windows 1251).
   http://www.aha.ru/~kis/

Dynasys-Psion Solutions Provider  
   Accessories for Psion WorkAbout
   http://www.dyna-sys.com

SeePsion  
   Read, write directly Psion Base serial 3 with logical synchronization. For PC Windows 95, 98, NT.
   http://perso.wanadoo.fr/dominique.coupleux/index.htm

Personal Web page for M.C.Wheadon (mcw@ukc.ac.uk)  
   Patsiena - Patience on your Siena
   http://www.ukc.ac.uk/php/mcw/pats.html

Phil Spencer  
   Popular shareware and freeware programs for the Psion 3a, 3c, Siena, Series 5 and Geofox-One machines.
   http://homepages.nildram.co.uk/~nicko/

Psion General Utilities  
   General Utilities for SIBO.
   http://www.ftp.uni-erlangen.de/pub/psion3/local/.,/MIRROR.src.doc/utils/

Kylom  
   Productivity software for Symbian phones.
   http://www.kylom.com/