ClipGrab screenshots

This app helps you download clips from various video sharing websites.
ClipGrab 3.4 : Configuring Output Settings

Alternative downloads

MediaHuman YouTube Downloader
This app lets you download YouTube clips with just a few clicks.
Apowersoft Video Downloader for Mac
This program helps you download online videos on your Mac.
Aimersoft YouTube Downloader for Mac
This app lets you download and convert YouTube clips on your Mac.