Favorite Mac OS X applications?

This is just going to be a quick post, asking for your help. For those of you who don’t know, I just recently got my first mac. It is an iMac G4, and I am looking for some nice and useful applications, preferably free that would be good for me to install and use. So please, if you have a Mac please leave a comment telling me what applications you use the most or your favorite applications and give a little bit about what it does.

Thanks for your help! Also, soon we might be doing a giveaway here at Gadgets and Tech so stay tuned.