TinyJPG - Compress JPEG images with perfect quality and file size
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Promo Instant Image Resizer - Automatically optimize images for web & social media (free!)
Bulk Resize Photos - Resize large photos in bulk
Compressor - Compressor adds power and flexibility to Final Cut Pro X export.
PQINA Photo Editor - A free, fast, mobile-friendly, online photo editor to quickly edit pictures.