E6b for Windows

Features:

Latitude-Longitude (great circle and rhumb line tracks)
Wind triangle (Hdg/Gs, Trk/Gs, W/v, crosswind-headwind components)
Fuel planning (fuel consumption, speed-time-distance)
Weight and Balance (take off/landing weight and centre of gravity)
Altitude-Airspeed (density alt, pressure alt, true alt, TAS-RAS-MACH)
Vertical navigation (rate of climb, top of climb, rate of descent, top of descent)
Timer (stopwatch functions)
Utilities (mini logbook, costing, holding patterns, critical point, point of no return, sunrise-sunset)
On-line help