Some math and education related resources I am aware of …
TEXT RESOURCES
* Active Learning Materials for Calculus
* Algebra
* APEX Calculus
* University of Waterloo (I)
* University of Alberta
* University of British Columbia (1)
* University of British Columbia (2)
* Experience Controls
* University of Toronto Scarborough Precalculus and Calculus Modules
* Mathematical logic and its proofs (with the software Lean)
* Manipulative Calculus Project: Integrating 3D Models into Active Learning Calculus Lessons
* University of Toronto First Year Calculus Preparation Material
* Stitz Zeager Precalculus Material
* Math in Society
* eCampusOntario
TOOLS
* Insight Maker
* Mathlets (Math Demos from MIT)
* Academo
* Bird Song Hero
* Desmos
* GeoGebra
* Math Games with bad drawings
* Phyphox
* Order of Operations calculator
* Random
GROUPS
* Canadian Mathematics Society
* Canadian Mathematics Education Study Group
* First Year Math and Stats in Canada
* University of Waterloo Math Teaching Seminars
* Online Seminar on Undergraduate Mathematics Education
* Fields Math Ed Forums
* RabbitMath