The Reccurent ETDS (online) seminar: https://sites.google.com/view/recurrentetds/home (by Nishant Chandgotia and Shilpak Banerjee)
Database for researchers and conferences in dynamical systems: https://www.ergodictheory.net/ (by Stefeno Luzzatto and Tanja Schindler.)
An audio visual broadcasting for mathematics: https://www.carmin.tv/en/
Nick Higham's blog - https://nhigham.com/popular-posts/
Living Proof: Stories of Resilience Along the Mathematical Journey
What is mathematics? (by Richard Courant and Herbert Robbins).
3 Blue 1 Brown youtube videos.
What are Lyapunov exponents and why are they interesting? (by Amie Wilkinson).
The Princeton Companion to Mathematics, edited by Timothy Gowers.
Visual Complex Analysis, Tristan Needham.
Books by A. Y. Khinchin.
Differential forms and applications, P. do Carmo.
Books by Ethan Kross.
The Atlas of the Invisible and Where the animals go - James Cheshire and Oliver Uberti.
My Favourite Theorem - Kevin Knudson & Evelyn Lamb
A Brief History of Mathematics - BBC Radio 4
The Moving curve - Rukmini S
Articles of Interest - Avery Trufelman
LeVar Burton Reads
The Happiness Lab with Dr. Laurie Santos