Below are links to some mathematical things that I use/enjoy on the internet.
Macaulay2 is a software dedicated to computations in Algebraic Geometry and Commutative Algebra.
My pages on Google Scholar, GitHub, arXiv.
Here is a short essay by de Cataldo and Migliorini introducing Perverse Sheaves, as part of the AMS "What is...?" series.
Here is a short essay by Roger Wiegand introducing Syzygies, as part of the AMS "What is...?" series.
Here is a video lecture by Pramod Achar introducing the Springer Correspondence.
Here is a video introduction to Schubert Calculus, directed towards a general audience. It is an episode on the PBS YouTube channel Infinite Series.