Free distance calculation software for windows

Paraboloid Antenna Calculation 1.0 is a convenient tool which can be used whenever you want to calculate the efficiency of your antenna. Paraboloid Antenna Calculation calculates geometry, gain, losses, efficiency, directivity pattern and other parameters of primary fed and offset parabolic antennas.

The Filmcalculator is a program for people working in the film business. It is mainly useful for D.O.P.s, camera-operators, assistants, clapperloaders and gaffers but also for still photographers and video cameramen.
Primarily developed as a personal tool, the Filmcalculator has grown to a professional program with users world wide. Distribution as shareware makes it legal to make copies for colleagues and gives everybody the opportunity to try the program and decide if they like it before actually buying it.
Filmcalculator is a software that helps with calculations needed while planning or shooting a production.
Main features:
Optical calculations:
- Depth of field
- Splitfocus
- Focal length to lens angle
- Lens angle to focal length
Macro calculations:
- Magnification factor
- Needed diopter
- Needed Split diopter
- Scale/Model/SFX
- Event and screen time to frame rate
- Stop motion counter
- Screen time to frames
- Recommended camera spreed for miniatures
Distance/Size calculations
- Distance and object size to focal length
- Focal length and object size to distance
- Distance and focal length to object size
- Matching lens and distance
- Matching lens and format
Filmlength/time calculations
- Time to filmlength
- Shooting time to screen time
- Rollsize to filmlength
- Filmlength to time
- Filmstock counter
- Timecode calculator
Lamp and lighting calculations
- HMI flickerfree speeds and shutter angles
- Beam angle/distance/width conversion
- Illumination calculations
- User adjustable lamp tables
- Color correction
Exposure calculations
- Exposure corrections for speed and shutter angle
- Exposure changes replacing lights
Electricity calculations
- Watts/Volts/Amps/Ohms calculations
- Power cable calculations
- Generator calculations
- General
- Sun set/rise and positions
- Sun mapping / listing
- Moon positions / phases
- Info about filters/filmstock/apertures
- And more.......

Calculate the distance between to geographical points using the Geo::Distance Opera widget All you have to do is input the latitude and the longitude of the first location and the same for the second and the widget automatically calculates the distance in km between those two places.
The Geo::Distance Opera widget uses the Haversine formula to calculate the distance between two locations.
System requirements:
- Opera 9 or later