My top 10 open source software

I discovered the Linux and open source world around 4 years ago, and from that date I’m trying to know more open source software or projects.

I must say that they changed my life both as I started to use different software but the most important thing, in my opinion, is that I’ve discovered a different way to think to software and collaboration, or should I say understand what really means Free software ?

There are different open source software and projects, that I use in my work or at home and that in some way changed (in better) my life: