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Encyclopedia of Mathematics. Wiki.

MacTutor History of Mathematics archive. At University of St Andrews, Scotland.

The Mathematics Genealogy Project - Welcome! Database of Doctors of Mathematics.

Math Is Fun - Homework Help. For kids.

MathCamps (100 camps listed… and counting!). Math camps (largely/all for children and young adults, such as Summer camps at higher educational institutions.)

Math Nerds Free Math Help and Tutoring.

Math World. Wolfram Research's Math World, for serious students/mathematicians.

planetmath.org | Math for the people, by the people. For serious students/mathematicians.

Equation World. At Russian Academy of Sciences.

Langlands Programme to unify math.
Proof Wiki. For serious students/mathematicians.

Wolfram|Alpha: Computational Knowledge Engine. Wolfram Research's public computational knowledge engine, similar to their software, Mathematica.

Graphing, Fraction & Scientific, Financial, Basic, Printing, Calculators | CASIO America, Inc.

Calculators – Graphic, scientific and financial calculators. Hewlett-Packard handheld calculators.

Calculators and Education Technology by Texas Instruments. handheld calculators.

Online Math Calculators. Calculators.org (also has applied math)

Good Calculators: Online Calculators - Tax, Finance, HR, Mathematics, Engineering. GoodCalculators.com. Various online calculators: mathematics, physics, engineering, conversion.

Free Online Math Games and Calculation Tools for Children, A Guide to Math Calculators, Conversions, Formulas, and Reference Tables, Free Online Calculation Tools and Utilities for Children. OnlineLoanCalculator.org (also has various applied math resources).

Mathics - A free, light-weight alternative to Mathematica. Free/Libre Software alternative to the largest mathematics program.

Category/Mathematics - Free Software Directory. Free/Libre Software.

Philosophy (Bookshelf) - Gutenberg. Project Gutenberg Philosophy page, including mathematicism.

Age of Reason. Internet Sacred Text Archive page with some modern mathematicism and other Western philosophy.

Sacred Texts: The Classics. Internet Sacred Text Archive page with some ancient/Classical mathematicism and other Western philosophy.

Western Philosophy at sacred-texts.com. Internet Sacred Text Archive page with some various mathematicism and other Western philosophy.

Illumination: the Secret Religion - The Sin Makers. Hockney, Faust, & Weishaupt's 'AC' & GS site (named for a fiction novel the site was originally about, and GS linked to above) on rationalist idealism, ancient/Classical through postmodern Western philosophy (including various Pre-Socratic & Classical & Hellenistic Hellenism, Heracliteanism, Empedoclean Pluralism, Platonism, Aristotelean logic, and Hermetism, Gnosticism, Neopythagoreanism, Neoplatonism, Leibnizianism, Hegelianism, Nietzscheanism) & science/sociology/religion.

Pythagorean Illuminati (PI) official Facebook page.

Smashwords – About Mike Hockney, author of 'The God Factory', 'The Armageddon Conspiracy', 'The Last Bling King', etc. Independent Hyperreality Books (e)books.

Mike Hockney Books and Publications Spotlight. Hockney, Faust, Weishaupt's, etc. independent Hyperreality Books (e)books.

Amazon.com: Mike Hockney: Books, Biography, Blog, Audiobooks, Kindle. The most detailed, in-depth, exhaustive, original, groundbreaking contemporary mathematicist philosopher/writer/editor, of the God Series, 'GS,' more mathematics-/science-heavy ebooks written after his AC WWW articles.

Smashwords – About Michael Faust, author of 'Nietzsche: The God of Groundhog Day', 'Mad As Hell: Why Everything Is Getting Crazier', 'The Right-Brain God', etc. Independent Hyperreality Books (e)books.

Amazon.com: Michael Faust: Books, Biography, Blog, Audiobooks,
Kindle. A Hyperreality Books writer working with Mike Hockney.

Smashwords – About Adam Weishaupt, author of 'Voices of the Movement', 'The Movement: The Revolution Will Be Televised', 'Sin for Salvation', etc. Independent Hyperreality Books (e)books.

Amazon.com: Adam Weishaupt: Books, Biography, Blog, Audiobooks,
Kindle. A Hyperreality Books writer working with Mike Hockney.

Amazon.com: The Illumist Army eBook: Brother Abaris. A writer mentioned at the end of GS.

Amazon.com: Customer Reviews: The Dunciad. Reviews of Brother Malus' censored ebook. A writer mentioned at the end of GS.

Amazon.com: Illuminism Contra Discordianism eBook: Brother Cato. A writer mentioned at the end of GS.

Amazon.com: The Citizen Army eBook: Brother Spartacus. A writer mentioned at the end of GS.

Amazon.com: Jack Tanner: Books, Biography, Blog, Audiobooks,
Kindle. The new AC ebook writer of Metamorphosis Publishing.

New writers (on Amazon.com, but no author pages) seem to be Joe Dixon, Mark Romel, Ranty McRanterson, Tom Strabo, Doctor Thomas Stark.

Apollo Institute of Reason (AC/GS-inspired site, mentioned there as their Facebook group, formerly The Gnostic 300 (only online group approved by The Pythagorean Illuminati.) This is their article site) & The Meritocracy Party. Apollo Institute of Reason's new information & social site, saying ‘We are the Apollo Institute of Reason, and we are dedicated to ushering in a new dawn for mankind. Politics, science, religion and philosophy will all be revolutionised under our influence.’

Apollonius Lux. Hyperian videos.

Buer (name of a logic/philosophy demon,) featured on AC, and a reviewer of Doctor Thomas Stark's ebooks.

CG Saliby, a Hyperborean Publishing writer.

Hyperianism - The Cult of Reason (also on Facebook and on Youtube) is ‘... the rational system of the future. It reveals the true mathematical nature of reality and your purpose. We have the equation for your Mind,’ and Hyperianism and its founder are sometimes featured on AC and the PI Facebook page. Stage/TV Stunt Artist Morgue is the founder, and is on Facebook and on Youtube where he summarizes and explains in detail the ideas such as described in Hockney's ebooks (maybe also in case people find it easier to watch videos before reading.)

The Hyperian Source - Through The Eye of Reason. Hyperian art/articles/videos.

ShadowMagick. Hyperian videos.

Christopher Langan's theory.

Spinbitz. Joel Morrison's Leibnizian and alternative/opposing philosophy-related site.

Joel Morrison's Books and Publications Spotlight. Leibnizian and alternative/opposing philosophy-related books.

The Universes of Max Tegmark. A physicist's mathematicism.

Math Comics. List of top maths comics.

Mathematicon Shop. Math/philosophy/science t-shirts, mugs, etc. that support this site.

Math Fail. Dedicated to combing maths with humor.

RSS | Mathematical Association of America

RSS feeds from ams.org. American Mathematical Society

MathWorld Headline News. Wolfram Research's Maths News

Mathematics - News - Science - The New York Times.

Math - Scientific American

RSS Newsfeeds - Science Daily. All Science Daily's Science RSS, but search/scroll down the page to find several mathematics ones.

Forums | planetmath.org

The Math Forum @ Drexel University

Math Help Forum

Usenet alt.math newsgroup

Usenet alt.sci.math.design_theory newsgroup

Usenet alt.sci.math.galois_fields newsgroup

Usenet alt.sci.math.probability newsgroup

Usenet alt.sci.math.prediction newsgroup

Usenet sci.logic newsgroup. Has discussions of mathematical logic.

Usenet sci.math newsgroup

Usenet sci.math.num-analysis newsgroup

Usenet sci.math.research newsgroup

Usenet sci.math.symbolic newsgroup

MainPage - EFnetMath. EFnet IRC maths chat room.

Freenode Math Wiki. Freenode IRC maths chat room.

Mathematics Chat. Web-interface to rooms in this section, and others.

Undernetmath's Weblog | The friendly math chat on IRC. Undernet IRC maths chat room.