Camtasia is one of the most popular screen capture software applications for Windows and the Mac and is produced by TechSmith. Use it to record on-screen activity or import HD camera video, customize and edit content, and share your videos with others. It has similar functionality to Captivate, can record and export PowerPoint presentations as movies and has a good selection of output file formats.
Camtasia requires a program to be installed on your computer and will cost about £207 for Windows and £69 for the Mac (2014 prices). Educational discounts are available, and a free, fully functional 30-day trial is also available.