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Databases:
On-Line Encyclopedia of Integer Sequences (Sloane) Superseeker
Basic Definitions of Complexity Classes
Theorems of the 21st century
MathFiction
Combinatorics Video Collection by Igor Pak
Conferences:
Combinatorics Conferences
TCS Events
Acceptance ratio of TCS Conferences
János Pach's schedule
Academics:
Erdős number and collaboration distance
Mathjobs
Me on:
Google Scholar
MathSciNet
zbMATH
Scopus
DBLP
Research Gate
Mathematics Genealogy Project
MathOverflow
CSTheory Stackexchange