Open_Problems

Open Problems - Collected by Jeff Erickson. Mainly in geometry.
Open Problems from the Geometry Junkyard - Compiled by David Eppstein of the University of California at Irvine.
Open Problems on Discrete and Computational Geometry - Compiled by Jorge Urrutia, University of Ottawa.
The Open Problems Project - A project to record open problems of interest to researchers in computational geometry and related fields.
Steiner Trees - Open Problems with Steiner Trees, maintained by Joe Ganley.