cclive is a lightweight command line video extraction tool for Youtube and other similar video websites. It is a rewrite of the clive software in C++ with lower system footprint and fewer dependencies.
cclive is primarily a "video download tool" but it can also be used along side with video player software, like "mplayer", for viewing streamed videos instead of the Adobe flash player.
At a glance
Intended to be lightweight
Command line tool (see abby for GUI)
Cross-platform video download tool for Youtube and similar websites
Free software, licensed under the terms of GNU General Public License (v3)
Rewrite of the clive software in C++ with lower system footprint and fewer dependencies
Can be used to view streamed videos with "mplayer" or similar player software
Not a universal video download tool; limited to supported video websites
Ports are known to exist for at least BSD, Linux, Windows, Mac, OS/2 and Solaris
You can get a more up-to-date list with the --hosts command line option.