From Miguel Guhlin who got it from Leonard at the Mobile Learning Blog:

TechSmith, the makers of Camtasia Studio (one of the best screen recording and video editing tools around) are offering the full version of Version 3.1.3 for free download. This is a terrific tool for all educators to create resources as well as for learners to create their own digital stories and videos – so get it while it’s hot.

Click here to download Camtasia Studio 3.1.3.

Click here to request a software key to register Camtasia Studio 3.1.3 as a fully licensed version.

Windows only, unfortunately.