
NIST Digital Library of Mathematical Functions (DLMF)
The NIST Digital Library of Mathematical Functions (DLMF) serves as the authoritative, peer-reviewed successor to the Abramowitz and Stegun Handbook

The NIST Digital Library of Mathematical Functions (DLMF) serves as the authoritative, peer-reviewed successor to the Abramowitz and Stegun Handbook

Great for rapid estimations of the cost of your next plastic injected part. It has a nice database of plastic

Basic but does it well, with history, fractions and all features you want from a scientific calculator: GeoGebra Scientific is

FEM software. Install is normally required (Mac, Windows, Linux) … but an online version is available (look at the right

Not the most feature-rich spreadsheet, but ZERO install or registration: Framacalc is a collaborative, web-based spreadsheet service hosted by Framasoft

A very good resource for online Audio Calculators, classified into 6 categories: Loudspeaker Crossover Acoustic Electronic Turntable Various that really
The largest online integer sequences database, searchable. It provides a searchable interface to identify sequences by numerical terms, keywords, or

Efficient and well organised (be sure to look at the “by Family” drop-down and not stay at the “Most Popular”

Provides engineering information and problem solving techniques and maths, all powered by a powerful search engine: WolframAlpha functions as a

Provides all the statistical tables when MS Excel has no formula to compute it automatically. All these tables here are
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