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Similar to the classic "Old Maid" card game. Your goal is to match all pairs

Find, sort, and eliminate similar photos.

Cloud storage and file syncing service, similar to Dropbox; free 15GB account.

Get rid of duplicate and similar photos automatically.

Merge similar Excel file type documents.

Tiling window manager similar to xmonad.

Drawing app, capabilities similar to Illustrator/Freehand/CorelDraw.

Rapid engineering and scientific prototyping, similar to MATLAB.

Plugin filter for Photoshop similar to Sharpen and Blur tools.

Kakuro is a Japanese number game similar to Sudoku.