an open URI-scheme and supporting practices/code for enabling seamless integration between websites and locally-running utilities, such as file-management tools.
an interpreted computer language originally designed for programming text adventure games. Its migration to the web now allows the author to create a much wider variety of graphical and non-graphical programs, all of which can be used online using nothing
a URL based identity system. An OpenID identity is simply a URL, and all the OpenID specification does is provide a way to securely prove that you own that ID on that URL. Unlike most identity systems, OpenID is completely decentralized.
an web application which supports online code reviewing. CVS, Subversion, Clearcase, Perforce, Visual SourceSafe and Bugzilla. There is a plug-in architecture for supporting other SCMs and issue tracking systems.