PUBLIC MARKS from knann with tag "open source"

It's a tool ... The dotReader is the "Swiss Army Knife" of e-book readers, a multi-function tool that is highly innovative and highly interactive. It's a community, a social networking tool... You are never alone when you use the dotReader. Be instantly connected and engaged to readers who share your interests. It's a library ... Content you download into the dotReader can be organized any way you wish - similar to the way you might organize and bookmark your favorite websites in your browser. However, not only can you search YOUR library, you can also search OTHER remote libraries from within the dotReader. Examples might include public libraries, publisher websites, eBook distributors, organizational documents, and others. Entire businesses can be built around this feature alone.

GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus. It received several international awards including the European and German educational software awards. It is open sourced, can be web-based or installed locally. Very similar to Geometer's sketchpad.

List of links to commercial, opensource or free screencasting software by platform

Multi-platform, open-source virtual meeting service. Can run on on server.