About two years ago, when I wanted to create my website, I discovered Joomla and PrestaShop. And few month ago I discovered Gimp and Inkscape.
I learned quite a lot about Joomla and Prestashop in all this time and I'm still learning about Gimp and Inkscape.
At first they looked strange to me, but then I got used to it. I have found a lot of tutorials and forums, where user can get some help.
Since then I discovered quite a lot of free and open source software. Some of them are really good and easy to use and I like them. I really like making tutorials how to use them.
For now there are mostly tutorials for Joomla, PrestaShop, Gimp and Inkscape and later hopefully there will be tutorials for other software too.