Watermark.ink - Online Photo Watermarker
uxtoast: Learn UX Design - Become familiar with design laws and learn how to use them.
textmark - Protect your content with an invisible, trackable watermark.
UX Challenges - Done reading about UX? Start doing it.
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.
Uxcel - The easiest way to learn UX/UI design