Free distances software for windows

ImageJ is a public domain Java image processing program inspired by NIH Image for the Macintosh. It runs, either as an online applet or as a downloadable application, on any computer with a Java 1.1 or later virtual machine
It can display, edit, analyze, process, save and print 8-bit, 16-bit and 32-bit images. It can read many image formats including TIFF, GIF, JPEG, BMP, DICOM, FITS and "raw". It supports "stacks", a series of images that share a single window. It is multithreaded, so time-consuming operations such as image file reading can be performed in parallel with other operations.
It can calculate area and pixel value statistics of user-defined selections. It can measure distances and angles. It can create density histograms and line profile plots. It supports standard image processing functions such as contrast manipulation, sharpening, smoothing, edge detection and median filtering.
It does geometric transformations such as scaling, rotation and flips. Image can be zoomed up to 32:1 and down to 1:32. All analysis and processing functions are available at any magnification factor. The program supports any number of windows (images) simultaneously, limited only by available memory.
Spatial calibration is available to provide real world dimensional measurements in units such as millimeters. Density or gray scale calibration is also available.
ImageJ was designed with an open architecture that provides extensibility via Java plugins. Custom acquisition, analysis and processing plugins can be developed using ImageJs built in editor and Java compiler. User-written plugins make it possible to solve almost any image processing or analysis problem.

Scale is a small freeware which presents some unusual tools to help in the design of forms, web pages, presentations and other visual materials. The main form is a Tool Bar, presented above, that you can position in a corner of the screen for easy use of the tools. The Tool Bar can be placed as an Icon in the system tray (13K) and, as all the other tools, can be moved freely around the screen and minimized to the task bar.
From the Tool bar you can open the Rule, to measure horizontal and vertical distances in 7 different units (pixels, twips, inches, centimeters, himetrics, characters and points); the Magnifier to enlarge, up to 30 times, any image or text in the screen (you can make precise measurement and color pick with this tool ); the Angle Measurement Tool, to measures angles formed by lines in the screen, in degrees and radians; the Color Mixer/Picker to mix and pick colors and get the respective codes in 6 systems (RGB, VB, HTM, CMY, CMYK and HSL) and a small Calculator with some useful features.