Contextualise is a simple and flexible tool particularly suited for organising information-heavy projects and activities consisting of unstructured and widely diverse data and information resources

Big PDF of useful things about data engineering, data mining, workflows, etc.

TheBigDB is a very loosely structured database of facts, free and open to everybody.

Entity mention disambiguation database from Google

Optimizing certain kinds of table joins using probabilistic methods.

A redis-like wrapper for javascript data storage using localStorage as the default persistent data-store.