oss4lib

RefDB has changed a lot since the last mention of it here. From the latest release news on fm:

"The PHP Web interface supports live links for keywords, authors, and periodicals which are displayed as "tag clouds". Automatic format detection from local files is done, and has a type-sensitive form for editing data. RefDB implements all SRU operations (explain, searchRetrieve, scan) with MODS output, and conforms to CQL Level 2. Namespaced XML output allows processing of schema-based TEI P5 and DocBook V.5.0 documents. Raw bibliographies were added. Searching for and styling of less-common fields was improved."

The source, perl client, and sru support code are attached.