McGill University. Algebraic number theory, with a special emphasis on elliptic curves, modular forms, and their associated L-functions.

Villanova University. Computational number theory and Diophantine approximation. Teaching material, resources.

Université Bordeaux I. Computations in number fields. Preprints.

NUI Maynooth. Measure theory and metric Diophantine approximation: Diophantine approximation on manifolds.

University of Leipzig. Arithmetic algebraic geometry: structure and arithmetic of abelian varieties; discrete logarithm problems; the regular inverse Galois problem. Publications, thesis. [Flags are language selectors.]

University of York. Metrical Diophantine approximation, harmonic analysis and applications to signal processing, chaos and biology. Publications, teaching material.

Brigham Young University. Cohomology of arithmetic groups, Galois representations. Papers, resources.

Institut für Diskrete Mathematik und Geometrie, TU Wien. Number Theory; Combinatorial Enumeration and Analysis of Algorithms; Stochastic Processes in Combinatorial Structures. Publications, teaching.

University of Zagreb, Croatia. Page on Diophantine m-tuples; Tables of high-rank elliptic curves; Link to mathematical departments and number theory groups and seminars; Information for students on courses in number theory and cryptography.