Math.com - World of Math Online Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly.
Active Sites for Active People | Gimpsy An Internet directory that only holds carefully reviewed interactive sites, using a unique action based classification method. Free and paid site submission.
NinjaUnits - Do calculations like a Ninja Convert, calculate and find answers for your questions with NinjaUnits. Complex web tools ready to help you getting the fastest results.
Calculate and Convert Online - Calculator-Converter.com Calculate and Convert Online - Calculator-Converter.com Calculator, Conversion Table and How to Convert.
Euro to Dollar Currency Converter - Convert Euros to Dollars To convert euro to dollar, use this free currency converter to calculate the US dollars equivalent of your euro amount at the current exchange rate.
Calculate and convert DPI / PPI to cm, mm, inches and pixels Online Calculator / Converter for image processing, printing, and editing. Resolution (Pixel, Mpx) ↔ Pixel density (DPI, PPI) ↔ Image size (mm, cm, in)