Where am I?
You are currently browsing the homepage of a site who calls itself the Freiwerkler. Freiwerkler is a term in german slang for people offering their works for free. The word implies the welcome greeting to you for entering an area which provides many kind of products in terms of a copyleft license.
What is copyleft?
Have a look at the Article about copyleft on wikipedia. Generally you can download and share copyleft-products free of charge.