Yes, I strongly prefer Free Software where possible, but sometimes no source solution exists, so you have to settle for free as in beer.
Let’s say you have a phone which claims to solve all your problems for you (yes I mean the iPhone), except syncing your calendar app over the air with something useful like Google Calendar. That is where the good folks at Nemus Tech come in. NemusSync is the solution you’re looking for as it’s completely free and fully featured. Other people hawking solutions to this problem want $40 to do this for you, or how about £20 if you want to be able to sync more than one calendar?
Anyway, the best way to ask for someone to open their source is to pony up first, so i did exactly that, and if you have the means please consider doing so as well. The donation page is at the very bottom of the programs’ main page; do the right thing folks.