Pixel Port is a magnifier, an eight-way color picker, a ruler, and a protractor. All features reside on a single compact floating palette.

Univerasl Desktop Ruler allows you to measure not only a straight line distance but any curved distance on the Screen. It allows you to measure quickly and accurately distances, areas and perimeters of figures on the screen. You can determine your own scale and get results in pixels and your units of measurement (feet, inches, meters, ...). It is useful for measuring distance and area on a map, finding area and perimeter in a house project.

The Screen Calipers are a unique application that allows designers to measure anything on a computer screen quickly and accurately. The application resembles a real-life Vernier Calipers, making the application so intuitive to use that no instructions are required.

The Screen Calipers can be used with any program where fast and accurate measurements are required including html layout, CAD design, Illustration, allowing measurement in any unit.

Five handy graphics tools available at any time from a single mouse click: The pixel ruler, color picker, screen capture, lens, mouse lens, and more.

Pixel Ruler features horizontal and vertical orientation, dynamic mouse measurement tracking in pixels, cool design.

DMControls.Lens is a fully customizable .NET control that enables you to retrieve the magnification scale of screen objects. Either selected bitmap objects or selected screen regions can serve as the source for zooming. Convenient dynamic rulers, selectable zoom factor, build-in controls meant for displaying xy mouse coordinates and a large number of other ever-useful features make the control one of the best solutions for software developers

The JR Screen Ruler is a great tool that allows you to accurately measure anything on your screen. This is especially useful when measuring graphics, web page browser sizes or whatever. Screen Ruler can display Pixels, Inches, Picas, Centimeters. It also allows you to rotate and set transparent background.

Build linear measurement skills, with English and metric rulers. This multimedia program uses the Microsoft Agent Peedy, a parrot character. Printed worksheets and tests can also be generated.

A tool to measure distances and angles on the desktop.
The distances can be measured in pixel, cm, inch, points or twips and the angle in radiant or degree.
The ruler is almost transparent so you can have it on the screen, while you are working with the applications below.
Additionally it has a screen loupe and a RGB value window.
You can also draw points, lines, rectangles, polylines, bitmaps and text as temporary objects on the screen.

A Ruler for Windows is a free on-screen pixel ruler for your PC. It provides you your choice between a rich woodgrain ruler, or at the touch of a button, a clear see-through plastic ruler. A Ruler for Windows is fun to learn and very easy to use.

How to find out the size of something on the screen or to take a closer look at it?

Use Perfect Screen Ruler. You will easily find out the size of any item on the screen, for instance, the size of a button or the distance between two points. You will be able to enlarge the image if necessary. It is useful when you measure some small images or when you need to study the enlarged area of the screen in detail.

Measure the distance between two points on your screen, get the exact location and size of an element on a web page, measure in pixels, centimeters or millimeters, both horizontally and vertically? Screen Ruler is your choice.

Desktop Ruler is, just as its name indicates, a virtual ruler utility/tool for your desktop. It has customizable size,
color, transparency, orientation and scale in pixels, centimeters or inches, as well as some other useful features like
Precise Measuring Tool with adjustable zoom, capable of measuring on-screen distances in any angle, not just
along the ruler, support for multiple monitors systems and customizable double-click action.

This is toolkit that allows you quickly measure anything on your screen, picking the colour value from any pixel of the screen and alter or produce your own colors with the Photoshop-style Color Picker.
This program might be useful for web developers who often face the need to quickly measure the size of an object or the space between objects on the screen up to a pixel, quickly detect the color in an HTML code or alter its HSB, RGB components.

Golden Section is an adjustable transparent design grid for web, graphic, logo and UI designs. It allows you to control and correct the sizes and proportions in your design project using the golden section ratio. Key features: multiple grid modes, including section grid and square grid; adjustable user interface for GUI, web and image design; full controllability over the mouse and keyboard; advanced settings for power users

JFDraw is a pure Java based graphics application and library package.It can help you to complete your mechanical, electronic, architectural graphs drawing applications, or even business process or workflow graphs issues.

Golden Section is an adjustable transparent design grid for web, graphic, logo and UI designs. It allows you to control and correct the sizes and proportions in your design project using the golden section ratio. Key features: multiple grid modes, including section grid and square grid; adjustable user interface for GUI, web and image design; full controllability over the mouse and keyboard; advanced settings for power users