"Free" vs "Open Source"

Before we start to work on the Kavita project, we read about "free" and "open source" software projects, and the difference between them. It's important to understand that "free" projects isn't about non cost software projects, the word "free" carried with it a moral connotation. It's more about freedom to share and modify for any purpose, but it can't be marketing as proprietary software. In that way, the "open source" software projects can be shared, modified and also can be using as proprietary software. The word "open source" appears to be part of a vocabulary to talk about free software as a development of business methodology, instead of as moral reference.