Notepad++ is a free (as in "free speech" and also as in "free beer") source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL License.

QElectroTech is a free software (licensed under GNU/GPL) to make electric diagrams. Written in C++ using the Qt5 library, it is freely available for the following platforms: GNU/Linux, Windows and Mac OS.