This online tool can be used to download (extract) captions / subtitles from YouTube in the language of your choice and formats such as plain text, vtt or srt.
This for the connoisseur collector! Save your favorite media from 9gag in an automated fashion using this command-line tool.
Find solution to a knight's tour problem starting with any position.
A simple 9x9 Sudoku Solver tool using backtracking. The current version runs on Python.
A very beautiful, counterintuitive and yet so simple puzzle! Have a look here, and see for yourself intuitively why it works.
A demo tool for scraping share prices from Google Finance.