- smush.it!: smush.it! makes optimization of your images a breeze. Created by Stoyan Stefanov and Nicole Sullivan, smush.it! is a tool that is available as a Firefox extension, a bookmarklet, or as a simple web-based application (hosted by Yahoo!).
- RIOT: RIOT – which stands for Radical Image Optimization Tool – is an image optimizer for Windows users that is available as a standalone application or as an extension of IrfanView. It supports inputs in JPG, PNG, and GIF files and has the ability to strip out image metadata for further reduction of file bloat.
- PNGOUT: Created by game programmer Ken Silverman, PNGOUT is a popular, free, and no-frills tool for lossless optimization of your images. PNGOUT can run in the command-line or Windows Run dialog box.
- Online Image Optimizer: The Online Image Optimizer from Dynamic Drive is a web-based tool for compressing your images further. You can either provide the link to the image you wish to optimize, or upload it from your local machine.