What are good computational geometry journals? I'm also counting geometric modeling as part of computational geometry. Are there any good journals that are considered to be non-mainstream in the US?
Computational Geometry: Theory and Applications and International Journal of Computational Geometry and Applications are the ones that focus on algorithms. For geometric modeling, there's Computer Aided Design, Computer Aided Geometric Design, Graphical Models.
I highly recommend Discrete and Computational Geometry: http://www.springer.com/mathematics/numbers/journal/454 If what you want is an excellent survey of materials related to discrete and computational geometry I also recommend this Handbook: http://cs.smith.edu/~orourke/books/discrete.html edited by Joseph O'Rourke and Jacob Eli Goodman.