[ links ]

Regular Conferences:
Arizona Winter School
AGNES (west coast version: WAGS)
QVNTS
Kolchin Seminar
Quebec-Maine
Geometrie et Theorie des Modeles

Conference lists:
Arithmetic Geometry Conferences (Kedlaya)
Algebraic Geometry Conferences
(Vakil)
Commutative Algebra Conferences
Differential Algebra Conferences

organizations
AMS
MSRI
ICERM

notes
ncatlab 
Jinhyun Park's Note Collection
Anton Geraschenko's Note Collection
Alexandru Buium's Note Collection
Keith Conad's Note Collection
Moshe Kamensky's Note Collection

computational
Sage
Macaulay2
Magma
lmfdb

forums
mathoverflow
math.stackexchange

comics
xkcd
abstruse goose