Project Gutenberg is the place where you can download over 30,000 free ebooks to read on your PC, iPhone, Kindle, Sony Reader or other portable device.
LibriVox provides free audiobooks from the public domain. There are several options for listening. The first step is to get the mp3 or ogg files into your own computer:
WebGraphing.com delivers real-time, step-by-step answers to challenging mathematics problems. There are a number of unique, patent pending features that make our calculators easier to use and more powerful than other graphing calculators. In comparison, our calculators take more of the grunt work out of demanding computations that contribute very little either to student learning or teacher productivity.
LoudLit.org is committed to delivering public domain literature paired with high quality audio performances. We pair together great literature and accompanying audio.\n\nPutting the text and audio together, readers can learn spelling, punctuation and paragraph structure by listening and reading masterpieces of the written word. Read and listen via your web browser or on your mp3 player. Regardless of how you enjoy the audiobooks (audio books), they are free.
Layers is a new service that enables you to speak your mind, overlaying videos, images and texts on top of any web page, and then to share it with anyone you want
Create diagrams online Real time collaboration. Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts. \nCacoo can be used free of charge.