Watermark.ink - Online Photo Watermarker
Shrink Me - Compress images with one drag / click
textmark - Protect your content with an invisible, trackable watermark.
TinyJPG - Compress JPEG images with perfect quality and file size
AG Audio Watermark Generator - AG Audio Watermark generator is a little app for both mac and pc that will help you to add an audio watermark to your original track in a fast & easy.
Aerate for macOS - Ridiculously good lossless image compression