Screencast-O-Matic is a screen capture tool that I have found very useful. Screencast-O-Matic allows you to record what you are doing on your computer, save it as a video file, publish it to YouTube and share. Screencast-O-Matic is a free tool that does not require an account to use. However, if you want to publish your screen recordings to YouTube to share, then you will obviously need a youtube (google) account. Simply go to the site and hit the big blue button "Start Recording" and your set. You can also talk while you explain what you are doing on the screen. This gives even more help to what you are trying to show/demonstrate. In order to do this, you need a microphone hooked up to your computer.
Applications for Education: If I were a technology integrationist, this would be one of my most useful tools because it would allow me to show teachers how to do things, rather than just trying to explain it. I also use this tool for my classroom. In trying the "flipped" idea a couple times, I recorded myself building a manor system, which the students watched and then built their own. If a student is struggling to figure out how to do something online, record yourself doing it and share it with them. Anything you want your students to see or something you need to demonstrate, this is a good tool for you.