Wolfram Alpha

Across thousands of domains--with more continually added--Wolfram Alpha 1.3.0.4229002 uses its vast collection of algorithms and data to compute answers and generate reports for you.
MATHEMATICS:

• Geometry
• Trigonometry
• Discrete Math
• Number Theory
• Applied Math
• Logic Functions
• Definitions
• Elementary Math
• Numbers
• Plotting
• Algebra
• Matrices
• Calculus

STATISTICS & DATA ANALYSIS:

• Descriptive Statistics
• Regression
• Statistical Distributions
• Probability

MATERIALS:

• Alloys
• Minerals
• Crystallography
• Plastics
• Woods
• Bulk Materials

ENGINEERING:

• Acoustics
• Aeronautics
• Electric Circuits
• Fluid Mechanics
• Steam Tables
• Psychrometrics
• Refrigeration
• Structures

WEB & COMPUTER SYSTEMS:

• Website Data
• IP Lookup
• Notable Computers
• Data Transfer
• Port Numbering
• String Processing
• Hashing
• Unicode Lookup

MUSIC:

• Musical Notes
• Intervals
• Chords
• Scales
• Audio Waveforms
• Instruments
• Songs
• WORDS & LINGUISTICS:
• 
  
• Word Properties
• Dictionary Lookup
• Word Puzzles
• Anagrams
• Languages
• Document Length
• Morse Code
• Soundex
• Number Names

TECHNOLOGICAL WORLD:

• Communications
• Satellites
• Space Probes
• Photography
• Barcodes

Download link- Wolfram Alpha