The Web site is here to help by providing a place to post ads from both those groups.
It all began with a written ad from a disabled person asking for shoes number 46 ("cipele 46" in Croatian).
Here is the full story
How to contribute
Although the Web site is in Croatian and the initiative is local, you can help by writing some code and making a pull request. Everyone is welcome. Apart from UI strings, everything else is in English.