Jing allows you to take screenshots, record screencasts, and instantly share information. Jing is the low end of a suite of screen capture products. SnagIt provides a few extra features (such as saving videos in formats other than SWF) for a small fee. Camtasia is at the high end, with full video editing capabilities.
Simple screencasting and image capture tool. SnagIt is part of TechSmith's family of screen capture and video editing products. Jing offers fewer features, but is a free alternative. Camtasia is the most fully featured of the products, but also the most expensive.
Camtasia is Mac/Windows software for recording screencasts and editing video. Videos can be sent directly to YouTube or integrated with Google Drive. Camtasia is the high end of a suite of screen capture products. SnagIt is a cheaper alternative with fewer features. Jing, the most basic of the TechSmith screen capture products, is free.