American Mathematical Society
BIRS
CRM, Barcelona
EMS
IHES
IMU
Institute for Mathematics and its Applications (IMA)
Mathematical Association of America
Mathematical Sciences Research Institute
Mathematisches Forschungsinstitut – Oberwolfach
MathSciNet
Mathsite
Max Planck
Mittag-Leffler
Pacific Institute of Mathematics
Zentralblatt
Comprehensive TeX Archive Network [CTan]
GAP
Sage (a free open source alternative to Magma, Maple, Mathematica, and Matlab)
License is required.
MAGMA
Maple
MATLAB
Minitab
Wolfram (Mathematica)