Camtasia is used to record your computer screen, audio, webcam, and narrate existing PowerPoint or PDF presentations. After recording you are able to add annotations to your video.
Explain Everything is a screen casting and interactive whiteboard tool that lets you annotate, animate, narrate, import, and export.
Ink2Go is a screen annotation and recording software. You can write on top of any other application that is currently active on the desktop, even on a running video.
PDF Annotator lets you open any PDF file and add annotations, using keyboard, mouse or a Tablet PC stylus, directly on the PDF’s pages.
PowToon is a cloud based software program that allows you to add cartoon animations to your presentations.