There are many programmers making closed-source software using open source tools. For example, anything that runs on an embedded Linux platform is built using o

There are many programmers making closed-source software using open source tools. For example, anything that runs on an embedded Linux platform is built using open-source tools (e.g., GNU compilers and open-source libraries) and is usually closed-source. There is also anything that runs on an open-source interpreter (e.g., Python), which includes a lot of things that aren’t web apps.