[Python-Dev] Is Python Free Software, free software, Open Source, open source, etc?

This probably isnt the correct list, but I really dont want to start a philosophical discussion - hopefully people here are both "in the know" and able to resist a huge thread :-) Especially given the recent slashdot flamefest between RMS and ESR, I thought it worth getting correct. I just read a statement early in our book - "Python is an Open Source tool, ...". Is this "near enough"? Should I avoid this term in preference for something more generic (ie, even simply dropping the caps?) - but the OS(tm) idea seems doomed anyway... Just-hoping-to-avoid-flame-mail-from-rabid-devotees-of-either-religion :-) Mark.