Google search for: open source library software

As Koha does not support fulltext indexing and searching, it is integrated with Greenstone Digital Library Software for full text searching.
http://www.greenstone.org/
Search for: Keywords, title, author, subject, series

http://www.open-ils.org/
Evergreen depends on the following technologies Perl, C, JavaScript, XML, XPath, XSLT, XMPP, OpenSRF, Apache, mod_perl, and PostgreSQL.
Search: keywords, title, author, subject, series
Language selection.

As Koha does not support fulltext indexing and searching, it is integrated with Greenstone Digital Library Software for full text searching.
http://www.koha.org/document
LibLime Koha and LLEK are developed in Perl, with embedded Javascripts and HTML templates
MySQL as the underlying relational database

http://obiblio.sourceforge.net/
Written in: PHP
Search at: Title, author, subject, schlagwort, thema.

http://pkp.sfu.ca/software

Language: making it possible to have a journal published in two or even three languages

http://turbo.uni-hohenheim.de/wiki/index.php/Literaturverwaltung [german]