Lomont's Cross Sums
Here is a program I made to play, solve, edit, and in general let you enjoy Cross Sum Puzzles.
Over 150 puzzles can be found here and here!

Download here
Lomont's Cross Sums (830K self-installing executable)
Features:
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Play almost unlimited size cross sums
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Multiple chains of reasoning
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Includes over 10 puzzles
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Easily enter puzzles from magazines and from the web
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Save your work at any stage
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Spinning logo :)
If you enjoy this, and use it over 30 days, please send $15 to
Chris Lomont
Izi Wa Computer Miscellany
10620 Oak Chapel Dr
Ft Wayne, IN 46845
Please include a way I can email you updates and newer versions, and I will send the next version (see below).
If you would like to email me puzzles (CLOMONT at MATH.PURDUE.EDU) I will include them on my website and include them in future versions, with credit of course. Do not send others work or copyrighted material.
If I make over $900 (just 60 people!) then I will add the following features:
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NO NAGGING ITEMS IN PROGRAM! :)
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hint mode
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when over "sum" in hint (helper?) mode, show possibilities left/total , show amount left to fill in?
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when over square in hint mode, show possibilities
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copyright notices in file format, and other text allowed by user
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in play right click erases (toggles eraser mode?)
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make module to automatically create unlimited puzzles
- given a diagram, it fills it in if it can
- given a size, it creates total puzzle -
symmetry settings: diagonal, central, off-diagonal, both-diagonal, none
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allow user loaded background pictures
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remember last directory used for reading files, etc and ensure config saved to exe directory? or user profile?
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show solution text and timing should be optional
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hotkeys for commands
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more color schemes
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color/size/font schemes editable/savable/loadable
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printing
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PNG file export for web shots
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hint modes
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shift puzzle up, left, etc (move insert/delete rows, cols)
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best times for puzzle, number of moves
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rotate puzzle
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draw symmetry controls