Various mathematical links, unsorted & uncategorized, but useful [under construction]:

* Ivan Loseu's seminars. There are notes for almost every talk.

* Notes to Roman Bezrukavnikov's course "Canonical bases and representation categories", by Tina Kanstrup.

* An old page of the Geometric Langlands Seminar at Chicago, with many useful links.

* Dmitry Sustretov's English translation of the Trivium course.

* A pre-packaged GAP3, with Chevie package for computations with Coxeter groups, Hecke algebras, Kazhdan-Lusztig combinatorics, etc.

* SGA 4 1/2 typeset in LaTeX.

* LaTeX symbols lookup.

Japanese art of mathematical homepage

Some homepages I admire for their design, in random order.

* Shinichi Mochizuki

* Takeshi Saito

* Hidekazu Furusho

* Yasuhiro Wakabayashi