Phraseanet is an Open Source Digital Asset Management (DAM) software. Web-based application intended for managing multimedia databases (photo management but also video, audio and PDF documents). Includes its own full-text / thesaurus search engine.
TechDoc is a distributed system composed of a number of applications: a central java based web application using a SQLite database to import Technical documentation from CSV files (catalogue + files) and an Android based app or an iPhone/iPad app to install in a mobile phone, which is synchronized with the central web application and is able to work off-line and show the catalogue and files (e.g. PDF files).
iPhone/iPad app can be downloaded through the Apple App Store.
The Android version...
Web based music and discography library with some extra functions, eg. least distance finding beetween artists and albums. Look for an example on http://phabajin.net/musicdb