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QuickCast is a free and open-source (Mac only for now) app which allows you to easily record your computer screen activities, alongside with your voice into a standard video file that can be published and shared online.
How to use it: "Once installed, it's easy to record your 3 minute micro masterpiece. Simply select the QuickCast logo in your toolbar and then click record. You'll get a 5 second count-in and then it's showtime. Keep an eye on the QuickCast icon, it will indicate how much time you have left."
Quikcast allows you to record full screen or to select a dedicated region, and to add the recording of your webcam as well.
Free to use.
Find out more: http://quickcast.io/
Download Mac app: https://s3.amazonaws.com/quickcast-app/mac/QuickCast.dmg
Great tools for Screencasting!