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.
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 - Mirror, Mirror. 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, Tom Strabo, Doctor Thomas Stark.
The Pythagorean Illuminati (on hiatus until 2017.) Same subject/group as AC/GS (links above). Less focused on art/literature & social science, and more on a main goal of being a (philosophical/ontological) mathematics resource in the Pythagorean/etc. schools of thought, like the site of this links page, but still mentioning Platonist political philosophy and with a more complete/advanced set of mathematics resources.
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.
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 - Bringing Humanity to the Stars, is ‘... the rational system of the future. It reveals the true mathematical nature of reality and your purpose. We have the equation for your Soul,’ and is sometimes featured on AC and the PI Facebook page.
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.’
The Universes of Max Tegmark. A physicist's mathematicism.
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.
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.