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The full collection
Crosswords for Kids
Two volumes of proper crosswords for 9–12 year olds
A tasty snack of easy cryptics from David Astle
The one + only cryptic crossword reference app
Two volumes of Australian quick crosswords
The Puzzle Wizard
The Puzzle Wizard appears as an app!
eValuator / eVX
A scientific OSX + iOS calculator for evaluating algebraic expressions
It's a clock, and it's free!