ImageOptim decreases the file size of PNG, JPEG, and GIF images, even those "Saved for Web". It combines OptiPNG, PNGCrush, AdvanceComp, PNGOUT, Jpegoptim + Jpegtran, and Gifsicle for the best possible optimization.
iArchiver is an archive tool that supports many
formats that Apple forgot. It creates DMG, 7-zip,
Zip, gzip, bzip2, and many other file formats in
three easy steps. It can also convert between file