Ad open a free: open source a free software – tedy otevřený a svobodný software – je v podstatě totéž.
S čím by se to ale nemělo zaměňovat je „free“ ve smyslu „zdarma“ – proto se také říká: “Free software” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech,” not as in “free beer.”