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Some Open Problems - Kézdy's open problems.
Open Problems in Dynamical Systems and Ergodic Theory - Originally from the Katsiveli 2000 Open Problems Session, now maintained by Sergiy Kolyada. PDF/PS.
Open Problems in Dynamical Systems - A collection of papers outlining unsolved problems maintained at Stony Brook.
Some Open Problems - Open problems and conjectures concerning the determination of properties of families of graphs.
Open Problems for Undergraduates - A collection of open problems in Discrete Mathematics which are currently being researched by members of the DIMACS community.
The Open Problems Project - A project to record open problems of interest to researchers in computational geometry and related fields.
Open Problems in Combinatorics - Features links to newsletters, workshops, and papers.
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.
Steiner Trees - Open Problems with Steiner Trees, maintained by Joe Ganley.
Open Problems in Graph Algorithms - Compiled by Jerry Spinrad.

List of open problems in computer science - This article is a list of open problems in computer science.
List of unsolved problems - A list of unsolved problems may refer to several conjectures or open problems in various fields. The problems are listed below:
Problems in Latin squares - In mathematics, the theory of Latin squares is an active research area with many open problems. As in other areas of mathematics, such problems are often made public at professional conferences and meetings.
Open problem - An open problem is a known problem with importance or interest in some scientific area, that can be accurately stated, and has not yet been solved (no solution for it is known). Notable examples of for-long open problems in Mathematics, that have been solved and closed by researchers in the late twentieth century, are Fermat's last theorem and the Four color theorem.
Problems in loop theory and quasigroup theory - In mathematics, especially abstract algebra, loop theory and quasigroup theory are active research areas with many open problems. As in other areas of mathematics, such problems are often made public at professional conferences and meetings.