Masonry Construction Technology

Dozens of special calculators for solving complex equations and formulas in fields including: electrical, mechanical, chemical, electronics, civil, metallurgy, plastics, physics, and math.

Free graphing calculator that can be used both as a web application and mobile application.

Free calculators that can be used on a variety of browsers as well as mobile and tablet devices.

Calculator that handles conversions (fractions to decimals, Fahrenheit to Celsius, Roman numerals to Arabic numerals, etc.)

This tutorial by Russ Baker from Howard Community College (Maryland) gives more functions of the TI-83.

Not-for-profit organization that helps develops, supports, and stewards legal and technical infrastructure to maximize digital creativity, sharing, and innovation.

Restricts web searches to scholarly literature.

Public-domain books/articles from libraries around the world.

Books, movies, and musical performances plus the famous Wayback Machine.

Resources for teaching and learning, with emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines.

Training and communication tool for promoting hearing loss prevention. It allows a user or trainer to demonstrate the effects of noise exposure on hearing without experiencing an actual noise-induced hearing loss.

Books, prints, photographs, and historic magazines.

Provides digital copies of public domain books.

Free e-books for which U.S. copyright has expired.

Programs/activities within the executive, legislative, and judicial branches.

Crowd-sourced encyclopedia.