Reference
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.
SA Dictionary
WordWeb
Shipra's Dictionary
kamus
Merriam-Webster
Wordinn English to Urdu Dictionary
AlbionXP
MADHURA Dictionary
ABBYY Lingvo Multilingual Edition
SmartBee
TypeText
AnyMem
SlovoEd Deluxe English-Russian
Lector
Fora Reader
Salts & Solubility
Grammar Slammer
Classware
LeoMoon Persian TTT
SlovoEd Classic German-Russian
Balloons & Buoyancy
KanjiBrowze
Declan's Japanese Dictionary
As-U-Read
IndoDic E-Kamus
Visual Dictionary
555 Timer
Guitar Power
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.