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Smart notepad with built-in calculator.

Scientific calculator of colocalization coefficients.

Pregnancy due-date calculator.

Folder-size calculator.

The amazing bicycle-gear calculator.

Full-featured scientific calculator.

Musical calculator and look-up tool for recording engineers and composers.

Symbolic calculator with Markdown editor.

Genetic calculator to aid in designing breeding strategies.

Re-implementation of HP-42S calculator and HP-82240 printer.