Links
As it was done in the "olden days" of the Internet, here are some links that you may find relevant or interesting. (Always under construction and/or renovation.)
Departments and Institutes of Mathematics
Departamento de Matemáticas, UAM Iztapalpa (Mexico City) http://mat.izt.uam.mx/mat/
Departamento de Matemáticas, Facultad de Ciencias UNAM (Mexico City) https://www.matematicas.unam.mx/
Instituto de Matemáticas, UNAM (Mexico City) https://www.matem.unam.mx/
Centro de Ciencias Matemáticas, UNAM (Morelia) https://www.matmor.unam.mx/
Fields Institute (Toronto) http://www.fields.utoronto.ca/
Topologists and Set Theorists around the Globe
Jan van Mill: https://staff.fnwi.uva.nl/j.vanmill/
Alan Dow: https://webpages.charlotte.edu/adow/
Michael Hrušák: https://www.matmor.unam.mx/~michael/
David Fernández Bretón: https://dfernandezb.web.app
Software and Online Tools
Geogebra: https://www.geogebra.org/
Linear Algebra Toolkit: http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi