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.
barcode2printer prints barcodes via a network printer by IP address using an image or PostScript file. Using jpeg2ps through the commandline, it converts a barcode JPEG image into a PostScript file and sends this file to a network printer using an IP and port.