Greenstone is found at the website of University of Waikato and is a complete framework for creating an online digital library. If you have a papers collection that you want to gather up and present to the world this is the software to make it happen. This likewise works if you have a gathered oral history about something like a park bench mapping project that you want to collect and present in a single coherent fashion.
The software uses Perl, Java, and already has some unique curlicues that make it a good candidate for snapping.