Download from YouTube

best quality download :

youtube-dl youtube-dl -f "best" http://www.youtube.com/watch?v=P9pzm5b6FFY
youtube-dl -f best https://www.youtube.com/playlist?list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l
youtube-dl -f "bestvideo[width>=720]+bestaudio" https://www.youtube.com/watch?v=OHvY1DUxzfo&index=3&list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l
pip install --upgrade youtube_dl

References :

https://rg3.github.io/youtube-dl/
http://askubuntu.com/questions/486297/how-to-select-video-quality-from-youtube-dl

aria2 – Getting Started

Download from WEB:

$ aria2c http://example.org/mylinux.iso

Download from 2 sources:

$ aria2c http://a/f.iso ftp://b/f.iso

Download using 2 connections per host:

$ aria2c -x2 http://a/f.iso

BitTorrent:

$ aria2c http://example.org/mylinux.torrent

BitTorrent Magnet URI:

$ aria2c http://example.org/mylinux.torrent

Metalink:

$ aria2c http://example.org/mylinux.metalink

Download URIs found in text file:

$ aria2c -i uris.txt

References :
https://aria2.github.io/