Flight Planning

Aeroplanner
Offers online flight planning, sectional charts, and weather outlooks.
http://www.aeroplanner.com/

AirplaneCharts.Com
Aviation VFR and IFR Charts. Sectional and Terminal Charts. NOS Low Altitude En route Charts and Approach Plates.
http://www.airplanecharts.com/

Airports En Route
Airports directory with flight plan calculator. Computes distance, track, heading, ground speed and time en route between US and Canadian locations.
http://www.airportsenroute.com

Aviation Formulary
Introduction to the mathematical processes used in navigation including great circle navigation theory.
http://williams.best.vwh.net/avform.htm

Canso - Civil Air Navigation Services Organisation
Exists to ensure the provision of air navigation services for civil aviation communities worldwide.
http://www.canso.org/

Density Altitude Calculator
JavaScipt calculator for pilots. Determines density altitude from the altitude, air temp, altimeter setting and relative humidity.
http://wahiduddin.net/calc/calc_da.htm

Ed Williams' Aviation Page
Formulas and on line calculators for aviation navigation.
http://williams.best.vwh.net/

Flight Plan Information
Provides online flight planning and submission. Includes flight navigation log (printable) for generation of computed flight plans, Java applets for the calculation of wind correction and ground speed, mass and balance, density altitude, flight level, cross wind component and other aviation related calculations.
http://www.flightplan.za.net/

FlightLogXL
Flight log in Excel. Calculates heading, distance and time based on entered waypoints.
http://www.flightlogxl.com/

Flycalc
Flycalc is a web based, navigation tool for New Zealand based flight plans.
http://www.flycalc.co.nz/

The Institute of Navigation
Non-profit professional society dedicated to the advancement of the art and science of navigation.
http://www.ion.org/

Jeppesen Sanderson
Publisher of flight information, supported by computer flight planning services, aviation weather services, and aviation training systems.
http://www.jeppesen.com/wlcs/index.jsp

Joe's Navigation Course
Aeronautical navigation lessons for a beginner. Provides the lessons with graphics. Available in Dutch and English.
http://www.localnetnet.be/

National Air Traffic Services
Provides aeronautical information services including let down plates and aviation warnings. Free registration required.
http://www.ais.org.uk/

Nav Canada
Provides navigation services like air traffic control, weather information and many other services.
http://www.navcanada.ca/

NotamPlot
Free UK NOTAM plotting software for private pilots. Download, features and user guide. Limited features in free version.
http://www.notamplot.flyer.co.uk/

Penguin Air Electronic AFD and Planning
Source for the electronic Airport Facility Directory, approach plates, the FARs and the AIM.
http://www.penguinair.com/

PocketFMS
Flight planning and moving map software for PCs and mobile pocket PCs using Windows. Includes world-wide VFR maps, bi-hourly updated navigation data, weather integration and an extensive airspace warning system.
http://www.pocketfms.com/

QDM
Flight planning for the private and student pilot made easy. QuDieM Navigator wind computer and free on-line aircraft bookings.
http://www.qudiem.com/

Royal Institute of Navigation
If you have an interest in navigation in its broadest terms - from aircraft Cat III landings though sailing for pleasure to orientation strategies with young children, then you should consider membership of the RIN.
http://www.rin.org.uk/

U.S. Sectional Maps On-Line
Aviation Sectional maps for educational purposes. Not to be used for flight planning or in-flight navigation.
http://www.avmap.bizland.com