CompPad is described as 'OpenOffice extension to provide live mathematical and engineering calculations within a Writer document, allowing calculations to be documented using all of the resources of OpenOffice. It will have functionality similar to Mathcad, but is not intended to be a' and is an app in the education & reference category. There are eight alternatives to CompPad for a variety of platforms, including Windows, Web-based, Mac, Linux and Android apps. The best CompPad alternative is SMath Studio, which is free. Other great apps like CompPad are PTC Mathcad, MathStudio, Swift Calcs and Miramath.
Needs to run on Windows/Linux