Quiver mutation in JavaScript and Java.
The string applet by Jan Geuenich.
Atlas of Finite Dimensional Algebras by Jan Schröer
USTC Algebra Notes.
Cuadernos de Álgebra.
Maurice Auslander Conference.
The Catalan Combinatorics of the Hereditary Artin Algebras.
FDLIST list for representation theory of finite dimensional algebras Representation Theory of Algebras at Bielefeld.
FD Seminar Online seminar on representation theory of finite-dimensional algebras.
BIREP - Representations of finite dimensional algebras at Bielefeld.
Longitudinal Algebra and Geometry Open ONline Seminar - LAGOON
Seminario Caldas de Matemáticas y Estadística.
Seminario Sabanero de Combinatoria.
ITENUA Seminar.
Claus M. Ringel.
Henning Krause.
Bernard Keller.
Federico Ardila.
David Fernández.
Xiao-Wu Chen.
Gordana Todorov.
William Crawley - Boevey.
Mathematics Genealogy Project
Open Maths notes AMS
American Mathematical Soceity
Research Gate
Research Seminars
arXiv - Representation Theory
Math Jobs
Number Phile Youtube
Derivando Youtube
TED Talks
Las ecuaciones de la imaginación: Federico Ardila
Open Books: Library Genesis.
Open Papers: Sci-Hub
OEIS
UMALCA
CIMPA
Detexify: finding Latex symbols
Todxs cuentan: building community and welcoming humanity from the first day of class
Rehumanizing Mathematics by Rochelle Gutiérrez
Mathematical blackboards
If you find math too easy, you might check out Mathematics Made Difficult
The Fibonacci Quarterly
Canadian Mathematical Society
J. Ruiter, Puzzle Picnic.
S. Tatham, Simon Tatham’s Portable Puzzle Collection.
Art of Problem Solving