Squash 2 for Mac - The easiest way to compress and optimize images for the web
Shrink Me - Compress images with one drag / click
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Watermark.ink - Online Photo Watermarker
Image Resizer for Windows - Lets you resize images by right-clicking.
TinyVid by Kamua - Trim and compress video files to fit any size limitation