Xournal
Annotation, journaling, and note-taking apps are incredibly popular on tablets and smartphones. Xournal brings these capabilities to the Linux desktop. Students can utilize Xournal to annotate PDF files and capture ideas. Alternately, teachers might use Xournal to grade submitted papers. Extra credit: Use Xournal in conjunction with GfxTablet, an app that allows you to draw on your PC via your Android tablet.
Kazam Screencaster
Forget Kahn Academy; put students in the driver’s seat and let them teach the class. Screencasting is a powerful tool for demonstrating student mastery of concepts and ideas. Inspire students to become teachers, trainers, and digital experts with Kazam Screencaster, a simple desktop video and audio recorder.