Valentine's Day graph
y = x ± √(4 – x²)
WebAutogaph file
An Easter Egg
x²/4 + y²/4 + 5z²/36 = 1
and: r = z + 3.5
agg file
A pringle: x² – y² = z
(hyperbolic paraboloid)
agg file

PROFESSIONAL
resources (UK)
BubblyMaths
Caroline Ainslie
Bletchley Park
Code breakers
Cambridge Digital
Newton's Principia, etc
Chalkdust
For
math. curious
Corbett Maths
John Corbett
Exam Solutions
Stuart Sidders
Gresham College
Sarah Hart lectures
Hegarty Maths
Colin Hegarty
Kangaroo Maths
Matt Nixon
Steve Lomax
Maths Gear
Steve Mould
Mathigon
Philip Legner
Mathletics
Learning platform
Maths Careers
from IMA
Maths is Fun
Rod Pierce
MathsPad
Student Tasks
MEI: Integral
Subscription site
MEI: AMSP
Advanced Maths
MyMaths (OUP)
Interactive learning
NRICH: Online
students/teachers
Underground Maths
A level resources
PLUS Magazine
living mathematics
STEM Learning
Technology/Maths
TES Resources
Secondary
Maths
Transum Mathematics
John Transum
Tutor Pages
Maths Tutors search 
Resources from
BUSY TEACHERS
Toni Beardon
Aiming High
Jo Boaler
YouCubed
Graham Colman
Colmanweb
Mark Dawes
Quibans
Bryan Dye (the late)
MathsNet
Owen Elton
MatheMinutes
Jamie Frost
Dr
Frost Maths
Jonny Griffiths
Digitisers
Carom Maths
Risps for A level
Further Risps
Making Statistics Vital
James Grime
Singing Banana
Numberphile
Dina Grimes
Grimes Mathematics
Jonathan Hall
MathsBot
Snezana Lawrence
Maths is Good for You
Mark McCourt
EMaths
Paddy MacMahon
Resources
Peter Mitchell
Meikleriggs
Dr A Oliver
Past Papers/Solutions
Dan RodriguezClark
Interactive Maths
Andrew Sharp
Puzzle of the Week
Ben Sparks
Maths and Music
Don Steward (the late)
Median
Paul Williams
PGMaths
Mark Willis
YouTube videos
Martin Withington
Martin's Maths

REGULAR
BLOGGERS
Craig Barton
Online CPD
Blog
Podcasts
Diagnostic Questions
Variation Theory
SSDD
Venn
Diagrams
Andrew Jeffrey
The Mathemagician
CPD
Blog
Jo Morgan
Resouceaholic
Gems
Chris Smith
Weekly Newsletters
Colleen Young
Mathematics, Learning
and Technology

Overseas
Resources
= EUROPE =
teachMathematics
Jim Noble et al
InThinking
Tim Garry (IB)
= USA =
Physical Simulations
PhET
Tracker
Open Source Physics
Julia Robinson
Math Festival
Gather4Gardner
Classroom Resources
NCTM
Khan Academy
Sal Khan
eMathHelp
Paul
Study.com
Adrian Ridner
MathWorld
Wolfram
Matrices
Math Medics
Vectors
Paul Kirnu
= FAR EAST =
Mathster
Richard Noble, Mark Edes
= AUSTRALIA =
Seashells of NSW
Des Beechey
= INDIA =
Number Recreations
Railways Director
= SOUTH AFRICA =
Aiming High
Toni Beardon
SchoolMaths
Gerrit Stols
Dynamic Math
Michael de Villiers 
SOFTWARE
Autograph
Geogebra
Desmos
WolframAlpha
==
Geometer's Sketchpad
Cabri Geometry
Geom. Expressions
GXWeb
==
Google: Python course
Photomath
SymbolSalad
==
Convert to LaTeX
UnicodeDeccodes
==
Chartwell Yorke
MathType
FX Draw
==
Casio Calculators
==
Gather Town
Conferencing with conversation! 