Robin Good: Wink 2.0 is a free downloadable presnetation tool that works both on PCs and Linux computers.
"Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc).
Using Wink you can capture screenshots, add explanations boxes, buttons, titles etc and generate a highly effective tutorial for your users."
Key features include:
-> Audio: Record voice as you create the tutorial for explaining better.
-> Input formats: Capture screenshots from your PC, or use images in BMP/JPG/PNG/TIFF/GIF formats.
-> Output formats: Macromedia Flash, Standalone EXE, PDF, PostScript, HTML or any of the above image formats. Use Flash/html for the web, EXE for distributing to PC users and PDF for printable manuals.
-> Multilingual support: Works in English, French, German, Italian, Danish, Spanish, Serbian, Japanese, Brazilian Portuguese and Simplified/Traditional Chinese.
-> Smart Capture Tools: Capture screenshots automatically as you use your PC, based on mouse and keyboard input (great time saver and generates professional captures).
-> Performance/Quality: Creates highly compressed Flash presentations (few kbs to few hundreds of kbs, much smaller than competing commercial products) ideal for using on the web.
It runs on Windows and Linux.
Free to use.
Download it here: http://www.debugmode.com/wink/download.htm
More info: http://www.debugmode.com/wink/