They're pretty much interchangeable in this title. Saying "open source" instead of "free software" preserves the meaning but makes it less ambiguous. The differ

They're pretty much interchangeable in this title. Saying "open source" instead of "free software" preserves the meaning but makes it less ambiguous. The difference matters when you're talking about ideology, but it's not so important when you're talking about the legal status of a piece of software. The Open Source Definition was adapted from the Debian Free Software Guidelines, which the FSF approves of. According to gnu.org: "The two terms describe almost the same category of software" (https://www.gnu.org/philosophy/open-source-misses-the-point.html https://www.gnu.org/philosophy/open-source-misses-the-point....).