CompPad

CompPad is a LibreOffice extension for performing units-aware engineering calculations within a Writer document, allowing calculations to be documented using all of the resources of the Writer application. It has functionality similar to Mathcad, but is not intended to be a Mathcad clone. Rather, I hope it might prove more flexible and extensible, and that it might encourage other free / open-source alternatives to a proprietary engineering "Killer App."

CompPad allows you to create technical calculations in the form of conventional-looking mathematical expressions using the LibreOffice equation editor. This editor has a simple text syntax that some consider to be faster and more intuitive than other equation editors. Then, with the click of a toolbar icon, CompPad will evaluate the expressions and display the results, embedded in your document. All of the features of LibreOffice are available for documenting and formatting your document so that it can be presented with pride to co-workers, customers, professors, etc.