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Manual counter with the keyboard or the mouse on images
The only open source counter to count any items the simplest and easiest way with the keyboard, or the mouse specifically on images. After associating a key to each item, or a predefined graphical symbol for images, pressing the key or clicking on the image increments its associated counter, and displays (for the images) the symbol at the mouse's pointer location. Such a project is so simple a child could use it!
EXPR is a software package for the recording and analysis of animal behaviour. Recording is done by pressing particular keyboard keys on the computer. The software then saves the sequence and timing of behaviours. Note that the DOS (1995: https://sourceforge.net/projects/expr/files/expr/fb-port-expr-00-1995/EXPR-binary-DOS-0.0.1995.tar.gz/download) version is currently the only fully functional and is recommended for use. On modern computers, DOS software can run in DOSBOX (https://www.dosbox.com/).