RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX/BibTeX documents. It allows users to share databases over a network. It is accessible through command-line tools, through a web interface, from text editors (Emacs, Vim), and it contains a SRU server. Programmers can use Perl and PHP libraries to integrate RefDB functionality into their own projects. RefDB is released under the GNU General Public License and runs on Linux, the *BSDs, OS X, Solaris, and Windows/Cygwin.
BibDesk is a bibliographic reference manager for Mac OS X. BibDesk is designed to help organize and use bibliographic databases in BibTeX .bib format. In addition to manual typing, BibDesk lets you drag & drop or cut & paste .bib files into the bibliographic database and automatically opens files downloaded from PubMed. BibDesk also keeps track of electronic copies of literature on your computer and allows for searching your database through several keys.
BibDesk integrates well with TeX for creating citations and bibliographies. This integration includes a Citation search completion service, and drag & drop (cut & paste) support for adding citations to TeX files.