 freemathtexts.org  Alain Schremmer
Original texts that emphasize a very few but very powerful ideas; appeal to common sense and make no assumption of any kind about the students; and focus on helping readers convince themselves about mathematics. Written for use in developmental mathematics
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 f(t)  Kate Nowak
A blog by a selfdescribed "fulltime math teacher, curriculum inventor and refiner, adolescent listener, correspondencetoparents writer, practice problem feedback giver, and examplesetter" who has taught high school math since 2005. Posts, which date
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 functionspaces  eGroups
Subscribe to and join a free discussion about functionspaces and related topics. From eGroups' Math discussion groups.
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 Fun With Num3ers
A blog of mathematical puzzles, mostly in number theory. Posts, which date back to January, 2012, have included "Using digits 1, 2, 3, 4, 5, 6, 7, 8 and 9 only once (Part Two)," "Pythagorean triple – Digits Reversed," "Concatenation puzzle: when (A 
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 GalaxyGoo
An interdisciplinary, volunteer thinktank dedicated to exploring expressions of science and math with online technologies, for public benefit. Read interviews of scientists; explore math such as the sine curve with Flash, participate in forums and blogs,
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 garysmathsblog
One maths teacher's "personal musings" about his experiences, as well as maths resources and teaching tips to help teach maths. Blog posts, which date back to May, 2011, have included "Fraction word problem," "Dyscalculia," "Mean, median and mode rhyme,"
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 gealgerobophysiculus  Evan Weinberg
Thoughts on teaching, learning, and "the crazy process of having fun doing both with students." Posts, which date back to September, 2011, have included "How China Keeps Me Learning: Part I," "Lens Ray Tracing in Geogebra," "Take Time to Tech – Perspectives
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 GeoGebra Central  Guillermo Bautista
A collection of GeoGebra applets dating back to August, 2010: "Systems of Linear Equations," "The Angle Trisector," "Approximating Pi," "Area of a Trapezoid," "Four Leaf Petal," "Polygons with Equal Area," "Tracing the Derivative," "Paper Folding: Locating
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 Geometros
Makers of the CAD system SolidGraph, built on sgCore, a solidstate modeling library that allows programmers to add CAD system functionality to their programs. Read product reviews; get plugins; post to support forums and consult FAQs; see lessons, examples,
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 geometryannouncements  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for information about lectures, announcements, special meetings, and upcoming events concerning geometry. Read and search archived messages; and register to
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 geometrycollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions of topics covered in college geometry, problems appropriate for that level, and geometry education. Read and search archived messages; and
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 Geometry Discussion Groups  Math Forum
A gateway to the archives of the Math Forum's online electronic community comprising eight geometry discussion groups for all those interested in geometry. Access current news or follow a link to threaded past discussions to browse or search the archive
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 geometryforum  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. This was the main group for the Geometry Forum, the Math Forum's previous incarnation. Not currently used. Read and search archived messages.
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 geometryinstitutes  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. Postings include planning for and information about geometry institutes held around the country. The Forum's teacher workshops hold discussions on this group
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 geometryprecollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions concerning school geometry curricula, teaching geometry, new software and texts, problems for students, and supplementary materials such as
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 geometrypuzzles  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for interesting problems and conundrums that require only a knowledge of elementary geometry, and discussions of solutions. Read and search archived messages;
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 geometryresearch  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for research announcements, seminars, reviews, and abstracts of papers and discussions of same, and ideas for research. Read and search archived messages;
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 geometrysoftwaredynamic  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. This group focuses on discussion of such geometry software programs as The Geometer's Sketchpad and Cabri Geometry II. Read and search archived messages; and
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 geometrywiz  Teresa Ryan
Blog subtitled "learning about learning and teaching mathematics." Posts, which date back to November, 2013, have included "Reflecting on Learning Objectives," "Reflections and Inquiry," "What Started as Tough, Becomes Good," "Refresh, Reflect, and Reinvent,"
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 Get Help With Your Math Homework  Cramster.com
Find homework solutions from text books, lecture notes, and solved exams written by college professors for their courses. Subscription fees required. Ask questions and answer other members' questions "for self practice, karma points and goodwill" on the
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 GFBrandenburg's Blog  Guy Brandenburg
In his opening post, Brandenburg wrote, "I have been doing some research on educational progress (or lack thereof) in the Washington, DC school system before and after the reign of our mediadarling school Chancellor, Michelle Rhee...." The retired high
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 GOMATH  Cubic Science, Inc.
An Internet site to help high school students (grades 1012) of all levels with math skills. Programs such as Algebra 1 offer an interactive guide through a course and help students build up math skills and confidence. Math Programs are 46 week curricula,
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 Google Groups Discussion: TINspire  Rex Boggs, moderator
For users of the TINspire handheld, Rex Boggs has set up a moderated discussion group at Google Groups. The purpose of the discussion is to share knowledge and problems to make the technology more productive, enjoyable and enlightening. If you are interested
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 Got Math?  Dave Radcliffe
Blog by a community college math instructor and selfdescribed "GeoGebra fanatic." Posts, which date back to December, 2010, have included "Stacking cannonballs," "Counting with Integrals," "A Paradoxical Dissection," "Gelfand's Question," "Imagining
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 Gowers's Weblog  Timothy Gowers
Blog by a Cambridge University professor interested in analysis, combinatorics, arithmetic combinatorics, and "general questions about mathematics, and how it is discovered and transmitted  hence this blog." Posts, which date back to September, 2007
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 Grad Blog  American Mathematical Society
A "blog for and by math grad students." Posts, which date back to February, 2009, have included "Finding an Advisor," "Navigating Seminars — A First Year's Perspective," "Five Pieces of Advice for the Beginning Teaching Assistant," "Choosing a graduate
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 Grandma Got STEM  Rachel Levy
Levy, a Professor in the Mathematics Department at Harvey Mudd College, blogs to collect public awareness and art projects that use grandmothers' pictures, names, and connections to science, technology, engineering, and mathematics (STEM) in order to
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 Great Maths Teaching Ideas  Will Emeny
Emeny's blog of teaching ideas and resources, which dates back to June, 2010, has included posts such as "Investigating the sum of interior angles in polygons," "Can you make practising the times tables fun? Yes, just give me three dice," "When angles
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 The Great Probability Challenge  Daniela Cupples
In this handson probability and statistics learning experience, students perform a coin toss experiment, then predict, analyze, and present their experimental findings with visual graphing representations. Throughout the 20102011 school year, students
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 GreatTeacher.net  Robin Alexander
GreatTeacher.net provides free resources to the teaching community: userfriendly job classifieds, email, discussion areas, an interactive calendar, resource links, and other services.
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 Growing Exponentially  Heather Kohn
Blog of "reflections on teaching math and striving to do better each day than the last." Posts, which date back to August, 2012, have included "Olympic Fever," "Work in your head, Points in my head," "Graphing Calculator Activities," "Absolute Value Project,"
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 Hacktastic  Laura Taalman
Blog about "design, mathematics, and failure" by Taalman, a professor of mathematics at James Madison University, as she learns JavaScript, three.js, and WebGL. Posts, which date back to October, 2014, have included "Menger Menagerie," "Trigonometry Style,"
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 Harvard Sports Analysis Collective
Dedicated to the quantitative analysis of sports strategy and management, this Harvard student organization focuses on the intersection of sports, sports business, statistics, and problem solving. Original analysis and research into sports analytics authored
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 HASTAC Initiative  Humanities, Arts, Science, and Technology Advanced Collaboratory
HASTAC ("haystack") is a network of individuals and institutions inspired by the possibilities that new technologies offer us for shaping how we learn, teach, communicate, create, and organize our local and global communities. HASTAC is open to anyone;
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 herp, derp, math nerd
A Tumblr "documentary of my journey, mistakes and all," by a Canadian undergraduate double major at UC Berkeley. Posts, which date back to May, 2012, have included "mr cauchy, teach us your ways," "closed, open, and clopen: yes, it's possible," "real
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 History of Science and Math
A "free, communitydriven Q&A" for those interested in the history and origins of science and mathematics. Post, answer, and vote up or down questions such as "Ancient Chinese numbering system," "What evidence is there that Fermat had a proof for
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 Holistic Numerical Methods Institute  Autar Kaw
Open courseware, books, primers, journal abstracts, PowerPoint presentations, multiple choice tests, and other resources supporting a typical course in Numerical Methods for undergraduates majoring in science, technology, engineering and mathematics (STEM).
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 HomeworkCentral  HomeworkCentral.com, Inc.
A free online learning environment designed to provide students, parents, and teachers with links to selected Internet sites. Includes a Mathematics Discussion Board and, for teachers, a lesson plan search (search for math).
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 I Choose Math  Justin Lanier
Blog by a high school teacher in Brooklyn Heights. Posts, which date back to August, 2011, have included "SBG: Affective Quizzing," "FreeChoice Time: Origins," "Introducing Proof Using Formal Systems," and "Math is Personal: A smOOC about Meaning, Sharing,
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 The Ignite Show  Georgia Public Broadcasting
TV shows and blog that "raise respect and awareness of educators and education through the voices of teachers, parents and students" in studentcentered classrooms. Half hourlong videos that feature math teachers include episodes starring 2008 California
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 I Hope This Old Train Breaks Down...  Mimi Yang
Blog by a high school algebra, precalculus, and calculus teacher in Seattle, by way of teaching positions in New York City, El Salvador, and Germany. Posts, which date back to March, 2009, have included "Math Projects," "The magic of teaching; El Trifinio,"
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 iKodeko  iKodeko Software, Inc.
Free online math quizzes cover least common multiple (LCM), Roman numerals conversion, number to words, and algebra word problems. Review performance, and participate in discussions around individual test items. Download the iKodeko Worksheet Maker freeware
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 ILoveMath.org  Shelli Temple
ILoveMath.org is a comprehensive site for middle and high school math teachers full of "readytouse" lesson plans, worksheets, activities, and more. The site also features an active message board for math teachers to collaborate.
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 IMAGINARY  Mathematisches Forschungsinstitut Oberwolfach
A platform for open and interactive mathematics. Explore events, exhibitions, programs, galleries, handson, and films  and share your own activities, projects, and discussions. Started as a maths and arts exhibition for the German Year of Mathematics
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 I'm on a Learning Mission  Steve Wyborney
Blog by an elementary math teacher and instructional coach. Posts, which date back to August, 2014, have included "Finding Bedrock," "The Hundreds Chart Video Tweet: My Learning Risk," "The Parent's Story of the Child," "Exploring Multiplication (Animated),"
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 Infinite Sums  Jonathan Claydon
Blog by a high school math teacher in Houston, Texas, who "decided the corporate engineering world was not for me, so now I joke around with teenagers and teach them math. And soccer." Posts, which date back to June, 2011, have included "Standards Based
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 Infinite Tangents  Ashli Black
This "secondary mathematics education podcast for teachers," begun in March, 2013, invites other high school math teachers to respond to prompts such as "How do you start your teaching day?" and "What would you like to get done in the times between classes?"
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 Informal Math  Sam OlderbakOlderbak
Blog by a high school mathematics teacher in Phoenix, Arizona, "interested in technology and how it can be used to enhance student learning." Categories of posts, which date back to April, 2013, include 3 ACT.
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 Innovate  James L. Morrison, EditorinChief
A peerreviewed bimonthly ejournal on research and practice of the use of information technology to enhance education. Innovate invites users to "... do more than simply read. Use our onebutton features to comment on articles, share material with colleagues
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 in pursuit of nerdiness
Blog by a middle grades and high school math teacher, formerly in the South Bronx, currently in the Netherlands teaching both within the Dutch national curriculum (in English) and within the International Baccalaureate Middle Years & Diploma Programs.
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