Trimage (lossless) image compressor : Trimage is a cross-platform GUI and command-line interface to optimize image files via optipng, pngcrush, advpng and jpegoptim
Crunch : Crunch is a tool for lossy PNG image file optimization. It combines selective bit depth, color type, and color palette reduction with zopfli DEFLATE c...
PunyPNG : PunyPNG is a free website optimization tool that dramatically reduces the file size of your images without any loss of quality.
metaflop : Metaflop is an easy to use web application for modulating your own fonts. Metaflop uses Metafont, which allows you to easily customize a font within t...
RegPack : RegPack is a packer intended for use on minified Javascript code.
It is mostly suited to small size constraints (1kb, up to 4kb).
Squoosh is an image compression web app that allows you to dive into the advanced options provided by various image compressors.