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.
French & Armenian Dictionary
Nar Dictionary
FreeTranslator
English-Russian Phrasebook
SOUL
MB Free Zodiac Yoga
Free Dictionary Widget
Music Theory
MemSource Editor
CquickTrans
ASC Urdu-English-Urdu Dictionary
SlovoEd Compact English-Russian
Hooshyar Dictionary
Shetab Lash Dictionary
Dean's Law Dictionary
EN-MMDictionaryAddin
WhiteSmoke Translator
ShenProfessional
CMD
The Meaning
JquickTrans
Turkish Dictionary
Jitbit Virtual Keyboard
Aard Dictionary
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.