Onde Screen Rulers for Mac is a screen ruler for that that allows you to precisely measure the dimensions of objects on your screen in pixels, inches, picas, centimetres, and calibrated units. A built-in protractor measures angles in degree and radians. It features customizable settings, keyboard shortcuts, a magnifying detail window, a logger Window with memo, a stay on top setting, and a memorizing function.
JS Measurer measures a webpage's width and height interactively. It lets the user define an area in the page by dragging the mouse pointer. The object renders the area outline as the mouse moves, showing the width and height of the area in pixels, as well the coordinates of the top-left corner of the area. A bookmarklet is also available, so this object can be used as a link placed, for instance, in the browser toolbar.
comedirecord is an oscilloscope program to record data from a COMEDI-compatible device. Its philosophy is to save the data in its original unfiltered form but allow comfortable viewing of the data during an experiment. One can acquire data from multiple DAQ boards simultaneously, and also append data via an incoming TCP port, which could be a telnet connection into comedirecord or data from another program. Low-pass, high-pass, and notch filters can be switched on for each channel. A DC filter can be switched on, which is useful when observing small voltage changes at a high gain (for example, measuring small temperature changes). The output format is ASCII so that the data can be imported into GNUPLOT, scilab, or octave.