• WinChloe by Christian Poisson
• Chess Problem Database Server (PDB) by Schwalbe, German Chess Problem Society
• Yet Another Chess Problem DataBase (YACPDB) by Dmitry Turevsky
• Albrecht collection of twomovers by Udo Degener
• Meson chess problem database by Brian Stephenson
• Endgame Study Database by Harold van der Heijden
• Chess Studies database by Sergiy Didukh
• Solve a Study – Studies selected and commented by Gady Costeff (suitable for phones)
• Helpmate Analyzer A web tool to analyze and find themes in helpmates by Viktoras Paliulionis
• Py2Web Dynamic diagrams in HTML by Dmitry Turevsky
• Problemiste collections
• Chessarchive A personal database of chess compositions by Vitaly Medintsev and Svyatoslav Kravchenko
• Chess Problem Arcade by Keisuke Shinokita – problems from YACPDB to solve online

The project to develop a standard format for the representation of chess problems by Thomas Maeder

Chess composers’ names in various alphabets

Endgame Tablebases (EGTB)

• 6-men endgame databases at http://www.k4it.de/index.php?topic=egtb&lang=en
• 6-men endgame databases (online) at Shredder Chess
• 7-men endgame databases at Lomonosov
• Lots of information at the site of Emil Vlasák about tablebases and CQL
• Syzygy endgame tablebases hosted by lichess.org