CONV. - Convert YouTube video to MP3, GIF or MP4
Visily - The easiest and most powerful wireframe software for agile teams.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
You-Get - Command-line utility to download media contents from the web
Zeplin - Collaboration app for UI designers & frontend developers