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.
Questions in Topology
Part of the Topology Atlas.
Thrackle.org
John Conway's Thrackle Conjecture: a compilation of what is known about the question.
Open Problems in Topology
Collection includes problems in set theory, continua, algabraic structures, analysis, and dynamics. Page includes glossary of terms. Links are in PDF.
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