It is free. DiskTracker is the complete disk cataloging and labeling system for Mac OS X.
https://gist.github.com/636959c6247706798a0d752c1fa72283
https://gist.github.com/7cbc56eec5c75854a062f61c98535d2e
Lesson 7. Download TacTile.
https://gist.github.com/783745c020e7b8435464ee4cccd99709
https://gist.github.com/928f0a4c7798781fddb50e8baf2cd456
For downloading youtube videos currently using the program KrojamSoft KingVideo. Follow Apple Hacks over on Facebook and Twitter, or Gadget Hacks over on Apple Unveiled Yosemite: Here's What to Expect in Mac OS X 10.10 Jul 23, 2015 Every time I open a youtube video FF crashes.
http://bournyfilm.de/forum/showthread.php?tid=1269
http://www.ashonecraft.co.uk/forums/showthread.php?tid=1585
http://tariqalhanaee.com/index.php/forum/donec-eu-elit/407742-dnyhwxnz#406008
