Off Topic Recovering pictures on a memory card

[catou]

So I spent the week-end with my friends and when I tried to look at the pictures I took saturday, it didn't work. It says the file is either corrupt or damaged. I tried a couple of programs to try to get them back. It worked with one of them (media recover) but I'd have to pay 40 bucks to be able to save the pictures...

My computer is a mac. So I was wondering if someone knew of a free program I could try? I'd really like to get these pictures back.