Voip-Info.org is the premier VoIP and Asterisk wiki on the web. Compare and contribute VoIP resources.
Voip-Info.org is the premier VoIP and Asterisk wiki on the web. Compare VoIP resources, collaborate with IP telephony developers, and use Voip-Info.org as a resource for all things Asterisk documentation, business VoIP, PBX, and more.
ChemVisio is software which might be useful for educational purposes (non-organic chemistry, crystallography etc.). It might be a good visualization support for all people who need better illustrations than that you could see in books.