Reasons to be thankful

Hi guys

I was watching last weeks Linux Action Show which was based on reasons to be be thankful for Linux and open source in general and there was a few projects put forward such as openssl and apache etc,

for me Linux and open source flies in the face of the general rule that “you only get what you pay for” which is generally true but FOSS is one of the few things in this world (possibly the only thing) that is actually free with no strings attached and for that I am extremely thankful

So I’m just curious what FOSS projects are you guys most thankful for ?