Reference

Search Engine

• > Filewatcher.com

Computer Science

Networking

IP address, domaintools.com

Algorithms

• The Algorithmist wiki

Optimization

• NEOS Optimization Server, dozens of online optimization engines

Sciences

Symbols

• SI prefixes
• Greek

Properties and Constants

• > Fundamental Constants, Units, Conversion Factors, etc. (with electrical fundamentals)

Electrical Engineering

Digital Signal Processing

• DSP tutorial links
• Online book on DSP (current chapter)

Link to PDF version of the book

• Wavelets, the next big thing in data analysis?
• Wavelet Tutorial

Electrical circuits

• Retired professor's teaching aids on Electronics, Digital, and Microprocessor Technologies
• Transistor cheat sheet
• > Visual circuit simulator

Math

Calculators and Tutorials

• List of online calculators
• > Scientific Calculator
• Matrix multiplier +
• Purplemath, somewhat elementary tutorials