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Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

Online reference and resources - web development, software programming, electrical formulas.

Binaryhexconverter is an online conversion tool for converting binary, decimal, hexadecimal and other base conversion.

Ever-growing online calculator collection for calculating solutions for financial, business, health, math and more. All free to use, fast, uniform, and made with your best interests at heart.

YouTube is a place to discover, watch, upload and share videos.

High school level mathematics and computer programming lessons, activities and resources that are fun and challenging. Materials for students, parents and teachers.

Perform conversions between 2100 various units of measure in more than 70 categories.

The Math Forum is the comprehensive resource for math education on the Internet. Some features include a K-12 math expert help service, an extensive database of math sites, online resources for teaching and learning math, plus much more.

Purplemath contains practical algebra lessons demonstrating useful techniques and pointing out common errors. Lessons are written with the struggling student in mind, and stress the practicalites over the technicalities. Links and other resources als...

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

Converter provides units and measures conversions. For scientific, educational and general purposes to convert from one unit to another. For science and education.