 Dejascacchi
By Michele Deiana - Language: English - Italian
(1) Tactical Combinations - 3400 positions (each file 100) which were primarily taken from actual played games. Each of the tactical combinations was either played on the board in an actual match or could have been played as a different variation.
(2) Bestmove - 3100 training positions (each file 100) provided by Ulrich Haug, Ulm (Germany). No classification of positions according to difficulty or themes.
(3) Endgame studies
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 Taktik-Datenbank
By Uwe Auerswald - Language: German
Tactical Combinations - Source of Dejascacchi in pgn format
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Chess Tactics Server
Language: English
Currently 23,803 tactical chess problems with a degree of difficulty ranging from trivial to ambitious are provided to be solved against the clock. Your tactical performance will be measured by the Glicko rating system. The problems are rated too.
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 Chess Puzzles by GMs
There are probably 10,000 chess puzzles here but I am constantly surprised by puzzles the likes of which I've never seen before.
By Christchurch - Language: English
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Theory 
