Open Problems on Discrete and Computational Geometry
- Compiled by Jorge Urrutia, University of Ottawa.
- http://www.csi.uottawa.ca/~jorge/openprob/

The Open Problems Project
- A project to record open problems of interest to researchers in computational geometry and related fields.
- http://www.cs.smith.edu/~orourke/TOPP/

Steiner Trees
- Open Problems with Steiner Trees, maintained by Joe Ganley.
- http://ganley.org/steiner/open.html

Open Problems from the Geometry Junkyard
- Compiled by David Eppstein of the University of California at Irvine.
- http://www.ics.uci.edu/~eppstein/junkyard/open.html

Open Problems
- Collected by Jeff Erickson. Mainly in geometry.
- http://compgeom.cs.uiuc.edu/~jeffe/open/