Provides access to a wide variety of astrophysics, space physics, solar physics, lunar and planetary data from NASA space flight missions, in addition to selected other data and some models and software. http://nssdc.gsfc.nasa.gov/
A repository of databases, domain theories and data generators that are used by the machine learning community for the empirical analysis of machine learning algorithms. http://www.ics.uci.edu/~mlearn/MLRepository.html
Several hundred thousand economic time series, produced by the U.S. Government and distributed by the government in a variety of formats and media, have been put into a standard, highly efficient, easy-to- use form for personal computers. http://www.inform.umd.edu/EdRes/Topic/Economics/EconData/Econdata.html