Apps similar to Trimage include ImageOptim, which is open source and free for personal use. Other options are RIOT - Radical Image Optimization Tool, PNGGauntlet, OptiPNG and pngquant. Image Optimizers like Trimage are a crowded field, with more than 25 alternatives for Windows, Linux, Mac and the web.
IMAGEmini, a powerful photo resizer and optimizer, allows you to optimize all your photos by 80% ~ 20% comparing to their originals while keeping their original resolution, quality and png, jpg, gif formats.
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Mini-Compressor is an easy to use image compression tool. Compress images by right clicking on the images or folder of images. A viable alternative to other photo editing software if all you need to do is quickly compress a image.
