Resolve Document Object Identifiers (DOIs) to BibTeX objects.

A service to generate opaque (random), human-readable and URL-safe Digital Object Identifiers (DOIs).

Generate QR Codes from URLs

A solver for "word wheels": word puzzles in which the goal is to make as many words as possible from a set of nine letters, where one of the letters must be used in each word.

A solver for the New York Times daily Spelling Bee puzzle