- The Boise Problem Book - http://math.boisestate.edu/~marion/research/boiseproblembook/
- Problems in combinatorial set theory and topology, collected by Marion Scheepers.
- Kirby's Problem List in Low-Dimensional Topology - http://www.math.berkeley.edu/~kirby/
- Problems list in PostScript format.
- Thrackle.org - http://www.thrackle.org/
- John Conway's Thrackle Conjecture: a compilation of what is known about the question.
- Open Problems in Topology - http://www1.elsevier.com/homepage/sac/opit/toc.htm
- 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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