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.
WP Smush Alternatives
WP Smush is described as 'Strips hidden, bulky information from your images, reducing the file size without losing quality. The faster your WordPress site loads, the more Google, Bing, Yahoo and other search engines will like it' and is a Image Optimizer in the photos & graphics category. There are more than 25 alternatives to WP Smush for a variety of platforms, including Web-based, Mac, Windows, Linux and Wordpress apps. The best WP Smush alternative is ImageOptim. It's not free, so if you're looking for a free alternative, you could try ImageOptim or RasterFox. Other great apps like WP Smush are RIOT - Radical Image Optimization Tool, TinyPNG, Oxipng and Optily.