Open Problems from the Geometry Junkyard (Popularity: )

Compiled by David Eppstein of the University of California at Irvine.

Open Problems on Discrete and Computational Geometry (Popularity: )

Compiled by Jorge Urrutia, University of Ottawa.

The Open Problems Project (Popularity: )

A project to record open problems of interest to researchers in computational geometry and related ...

Open Problems (Popularity: )

Collected by Jeff Erickson. Mainly in geometry.

Steiner Trees (Popularity: )

Open Problems with Steiner Trees, maintained by Joe Ganley.