Green open source software
Free open source software (FOSS) is running the world. The information society is build upon the work of volunteer coders that have permitted the usage of their code freely.
The philosophy behind the FOSS movement is that the usage shouldn't be restricted in any way based on the use case of the code. It's all good as long the openness, attribution and redistribution clauses are respected. It's nice and also part of why it has become so popular. Being able to build on top of others code can be a huge saving.