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.
PROMT Personal
SlovoEd Compact English-French
CalcRC
Excel Repair Free
Personal Translator
Software Translator
Rhymesaurus
MB Free Kabbalah Astrology
ATLAS Technical Dictionaries
Acronym Database
Complete Home Library
Translation Pad
InfoStat
Dixio
Witty Dictionary
MB Free Vedic Astrology
OmegaT
TMS
Thaimeaning Free Version
IndoDic
Quick Multi-Languages Dictionary
English & Armenian Dictionary
Report Card Maker
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.