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Calculator
Online calculator  with arithmetic operations and ln. exp, x2, root, sin, cos, and tan functions
The MegaConverter  
The web's best place to figure what equaks what 
Martindale's 'The Reference Desk: Calculators On-Line'
The SuperMarket of converters. Convert anything to almost everything..
The spectroscopy tools
A fast and quick online tool to identify what chemical groups belongs to a spectral range including  NMR (1H, 14C), Mass spectroscopy and IR 
Metric System
 This site gives you everything that you wanted to know about the Metric System 
Chemistry converter
 Very extensive including concentration, diffusivity, viscosity, enthalpy, entropy, heat transfer coefficients and more
by Process Associates of America 
Engineering, Scientific Unit Converter
A Dictionary of Measures, Units and Conversions
A Dictionary of Units of Measurement
Temperature Conversion
Conversion of Units  
 Chemistry
Common Equivalent Weights and Measures
Measurements Converter
 Metric <--> US
Astro-Physical Calculator
Diet Calculator
Calorie Calculator
 Based on activity
Local Times Around the World
Euro convertor to the main currency
Universal Currency Converter

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