- Currency Exchange Rates, Bank of Canada: average rates and 10-year currency converter are also available.
- The Universal Currency Converter: currencies also include precious metals.
- EH.Net, How much is that?: compares past and latest rates.
- Current Value of Old Money: provides a list of online sources.
- Roman Numerals and Date Conversion: convert between dates in the Gregorian and Julian calendars, or between Arabic numbers and Roman numerals.
- Roman Numeral Year Date - A Conversion Guide: covers the basic principles of conversion.
- Time Zone Check: find a city on the interactive time zone map.
- Time Zone Converter: find out the time anywhere in the world.
- Dictionary of Units: conversion of measures and definitions of major systems.
- A Dictionary of Units of Measurement: alphabetical listing of units provides conversion factors and usage information.
- Metric Conversion Factors: conversion relationship between U.S. and international standards only.