u2dl

The smallest YouTube downloader in the world, coming in at 1652 bytes. Downloads full-quality videos from YouTube.

Pros

• It's small (1652 bytes!!!)
• Written in fish and standard Unix tooling
• Bypasses the "rolling cipher" with Advanced Technology™

Cons

• Doesn't download Widevine/DRM protected videos (but you knew that already, right?)
• Doesn't allow for format selection

Also see the tweets.