Open Problems in Topology - Compiled by the Algebra and Topology group, Faculty of Mechanics and Mathematics, Lviv, Ukraine. www.franko.lviv.ua/faculty/mechmat/Departments/AlgTop/Seminars/OpenInTopology.html
The Boise Problem Book - Problems in combinatorial set theory and topology, collected by Marion Scheepers. math.boisestate.edu/~marion/research/BoiseProblemBook
The Thrackle Problem - John Conway's Thrackle Conjecture: a compilation of what is known about the question. www.thrackle.org