Image Tuner is described as 'free software for batch resizing, converting, watermarking and renaming your digital photos and images from more than 20 image formats to JPEG, BMP, PNG, TIFF and GIF formats' and is an app in the Photos & Graphics category. There are more than 50 alternatives to Image Tuner for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is ImageMagick, which is both free and Open Source. Other great apps like Image Tuner are RIOT - Radical Image Optimization Tool (Free), XnConvert (Free Personal), FastStone Photo Resizer (Free Personal) and PNGGauntlet (Free).
AdvanceCOMP is a collection of recompression utilities for your .ZIP archives, .PNG snapshots, .MNG video clips and .GZ files. It's mainly intended for recompressing your rom, snapshot and clip collection of emulated games.
BorderMaker is a freeware Java tool that enables you to create borders, text and watermarks that can be placed on digital photos. Besides creating nice borders around photos, there is a lot of more stuff you can do with BorderMaker.
NConvert is a powerful command line multi-platform batch image processor with more than 80 commands. Compatible with 500 image formats. Features Extensive Toolset Metadata Editing. Transforms: Rotate, Crop, Resize, ...