Java applets

Real hyperbolic geometry

Hyperbolic plane tilings
 

Teichmüller navigator

Complex hyperbolic geometry

Sketching bisector intersections
 

Dirichlet domains for the Mostow groups
 

Dirichlet domains for the G(n,n,n;p) triangle groups, small or large
 

The Giraud procedure for the G(4,4,4,5) triangle group, test version (see also this paper for more details about the math).