Wing Way Systems
Navigation-Wonder, a shareware GPS mapping navigation software including voice response system [Windows].
http://www.vader-abraham.com/gpssoft.htm

USCG Navigation Center
USCG Navigation Center
http://www.navcen.uscg.gov/

DigiBOAT
DigiBOAT, the creators of Software-On-Board. SOB is FREE Navigation Software for all boaters. Uses C-MAP Charts with simple powerful tools, port info, tides, navaids, GRIB overlays, AIS, ARPA. Compatible with all NMEA devices.
http://www.digiboat.com.au

Navigation and Related Subjects
Covers celestial navigation theory, sextant errors and corrections, rhumb line calculations and coastal navigation and conning.
http://jacq.istos.com.au/sundry/navig.html

Tridentnav Systems
Tridentnav Systems develops and markets pc-based navigation software for maritime use
http://tridentnav.se/index.php?lang=en

Carnegie Mellon Robot Navigation Toolkit
CARMEN is modular, Open Source C software designed to provide basic navigation primatives including: base and sensor control, obstacle avoidance, localization, path planning, people-tracking, and mapping. Licensed under the GNU GPL.
http://www.cs.cmu.edu/~carmen/

Thales Navigation
THALES Navigation is a European manufacturer of high-precision navigation and positioning systems based on GPS and GNSS technology. The company designs and markets innovative and highly-advanced equipment for professional applications in marine or land environments.
http://www.thalesnavigation.com

Innovative Navigation
Development and commercialization of navigation systems for inland navigation as well as consulting services in the fields of control theory, system theory, multi-sensor systems and artificial intelligence.
http://www.innovative-navigation.de

Laser Navigation System
Laser navigation of robot based on PC computer using artificial intelligence.
http://www.geocities.com/progsk/rob/

The European Space Agency: Satellite Navigation
ESA Navigation homepage, features the latest news on space-based navigation systems and Galileo and EGNOS
http://www.esa.int/esaNA/index.html