What are the best image compressing free softwares?

Posted:
in Mac OS X
I am aware of the fact that there is really no magic when it comes down to image compression however,  i was wondering if anyone of you has had a good experience with some softwares. There is quite a lot on the internet and i would love to narrow it down to the most suitable free ones. It would be great if i got some recommendations! :smiley: 
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