Glassbook also provides digital book distribution services to publishers and others.
EchoStar provides digital video recorders to as many as four million customers.
Anacomp provides digital document-management services using the Internet and other technologies.
PVI is a unit of Cablevision that provides digital media to sports and entertainment programs.
Paysafe, which provides digital payment systems to businesses and consumers, has seen its shares slump by around a quarter.
Last year, Green created* NationBuilder, a software platform that provides digital tools for political campaigns and community organizers.
The company provides digital subscriber lines to 2,000 customers in Manhattan, Philadelphia and parts of northern New Jersey.
Another advocate of geolocation software is RealNetworks, which provides digital media technology and distribution services for an array of industries, including sports leagues, broadcasters, movies and music.
Under the deal, the existing shareholders of 7digital, which provides digital music services for brands including Samsung, HTC and Pioneer, will control 75% of the new company.
Mr. Murdoch picked the former New York City schools chancellor Joel I. Klein to build the division, which provides digital learning tools to teachers and students.
