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RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents, sort of a Reference Manager or BibTeX for markup languages. It is portable and known to run on Linux, Free/NetBSD, OSX, Solaris, and Windows/Cygwin.
Oneliner integrates UNIX shell with Emacs text editor. Oneliner provides various syntax for integration. (e.g. You can connect 'shell pipe' and 'Emacs buffer' directly with simple syntax.)
Records mode allows Emacs users to keep an online personal journal. Records indexes your personal journal by subject and date, understands web compatible links to a variety of documents, keeps track of TODO lists and operates as an editor and a browser.