Starting a community answer, in line with your model question


Mesh Generation
===============

[Mesh Generation: Application to Finite Elements][1] (P.-L. George and P. Frey) Hermes, Lyon, 2000. A clear primer on the core technology and terminology of mesh generation. Written in a fairly mathematical style, which might not appeal to those of a more practical outlook. Will fit well with Gmsh, due to the cross-pollination of authors and project.

Geometry and topology
====================
Edelsbrunner, Herbert. [Geometry and topology for mesh generation](https://books.google.com.co/books?id=v6BybEYVGqYC&lpg=PR11&ots=nurp-0Dfnh&dq=Geometry%20and%20Topology%20for%20Mesh%20Generation&lr&pg=PR11#v=onepage&q&f=false). Vol. 7. Cambridge University Press, 2001. This book concentrates on creation of meshes of triangles and tetrahedra, and the mathematics behind them.



  [1]: http://onlinelibrary.wiley.com/book/10.1002/9780470611166