Schoology is an online learning management system. It offers many free features to teachers, such as: Personalized Homepage, Course Profiles, Calendar, Online Homework Dropboxes, Create Assignments and Events, Create Tests and Quizzes, Online Gradebook and Attendance, Track Student Usage and Course Analytics, User Connections (Professional Networks), Messaging, Customizable Notifications, Announcements, Discussions, Group Workspaces (Collaboration), and more...
Kidspiration provides a cross-curricular visual workspace for K-5 learners. Students combine pictures, text, numbers and spoken words to develop vocabulary, word recognition, reading for comprehension, writing and critical thinking skills.
eInstruction Workspace (comes with the Mobi, but I use it all the time instead of PowerPoint) Livescribe Desktop (free, but without the pen there isn't much you can do) Animationish (not free, but the most fun art animation program I have ever seen!) Hyperstudio5 (not free, but worth the minimum price - much more creative than PPT!)