It's one thing to have an encyclopedia and quite another to have software that combines a couple of those. Such software usually gives you more options and better and easier search engine. Check out this software category, read reviews on these education applications, take a pick, and download instantly.
Madan Puraskar Pustakalaya,Patandhoka
Accounting Software Company
GNU General Public License
Swiss Academic Software GmbH
McGraw Hill Companies
Cambridge University Press Holdings Limited