TubeBuddy is a browser extension to optimize your Youtube videos and increase reach rate.The best side of it is that it is free and easy to use. You can get rich variety of statistics about your video. TubeBuddy offers bulk operations, seo optimization, keyword suggestion, and many other features. You can also learn social reach of your video with Tubebuddy.

I mostly enjoy the Videolytics, it allows you to quickly spy on your competition. The thumbnail generator is also quite useful, when you need a decent thumbnail done quickly. It won't replace Photoshop, but it does the job.