Aigaion is a Web-based shared bibliography manager built on PHP/MySQL. It is based on the BibTeX format, but has support for other formats as well. Some of its key features are extensive support for organizing a bibliography in a topic structure, personal and public annotations on each publication, multi-user support, easy import/export, and an intuitive user interface.
refbase is a Web-based bibliographic manager that can import and export references in various formats (including BibTeX, Endnote, ISI, RIS, PubMed, MODS XML, OpenOffice, and Word 2007 XML). It can make formatted lists of citations in HTML, RTF, PDF, or LaTeX, and offers powerful searching and RSS support. Its OpenSearch and SRU/W services and support for unAPI and COinS metadata allow for easy access by clients and search engines.
RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents. Command-line tools allow interactive or scriptable access to the data which are stored in a SQL database. RefDB can also be accessed through a Web interface, a SRU interface, or via editor extensions (Emacs/vim). Libraries for Perl and PHP are available for programmers. RefDB provides sophisticated character encoding handling, using Unicode by default.
tbibtools provide a simple regexp-based BibTeX parser that can be used to sort bib files, reformat bib files, list keys in a bib file, and show bib entries matching a regular expression. It is available as both a script and a VIM plugin. It makes a few assumptions about how a bib file should look like.
scbib is a bibliography manager written in Scheme. It handles bibliographic data written in simple S-expressions and generates a bibtex file and an HTML file from the S-expressions file. It is capable of obtaining bibliographic data using the Amazon Web service. A simple converter for importing a bibtex file is also included.