The Eformulae site is a online resource of engineering formulas, science formulas, math formulas, physics formulas, chemistry formulas, tables, glossary of terms related to computer engineering, manufacturing technology, mechanical engineering, agricultural engineering, electronics engineering, metallurgy and machining processes. This is great for referencing and for better understanding a formula and how it is used.
Quick reference for engineering formulas and information. The Engineers Handbook site is an ongoing project created to present as much reference information as possible related to mechanical design, manufacturing and engineering in general. There is a great deal of information available online and this site is attempting to make available as much of it as possible. This site is not limited like EFunda, but that also means there are more advertisements on around the site, which is a bit annoying.