The Boise Problem Book
Problems in combinatorial set theory and topology, collected by Marion Scheepers.

Kirby's Problem List in Low-Dimensional Topology
Problems list in PostScript format.

Open Problems in Topology
Compiled by the Algebra and Topology group, Faculty of Mechanics and Mathematics, Lviv, Ukraine.

Questions in Topology
Part of the Topology Atlas.

The Thrackle Problem
John Conway's Thrackle Conjecture: a compilation of what is known about the question.