I came across a good software, take a look at it (Electronics 2000)
http://www.electronics2000.co.uk/From the developer web page:
Electronics Assistant V4.1 Available FREE
All the Electronics 2000 online calculators and more in a stand-alone application
Converts Resistor & Inductor colour codes, calculates LED series resistors, capacitance units, series / parallel resistors & capacitors, frequency, reactance & more
Calculation of nearest preferred resistor values with a choice of 5 series from E12 to E192
Print & save calculation results
Quick access to Windows® Calculator and up to 3 user-defined programs from the toolbar
Information panels showing theory and equations can be hidden to save space when not required
Windows® 98, ME, 2000, XP, Vista, 7, Linux (via WINE)