Maybe the outcome (and the contacts) of the EU-project IMPACT (Improved Access To Text) http://www.impact-project.eu/ might be worth a look.

Popular tools are - DSpace, GreenStone and E-print

Xena is an open-source software for use in digital preservation. Xena is short for XML Electronic Normalising for Archives. Xena is a Java application developed by the National Archives of Australia. It is available free of charge under the GNU General Public License. Version 6.1.0 was released 31 July 2013. Source code and binaries for Linux, OS X and Windows are available from SourceForge.

The Digital Preservation Software Platform (DPSP) is free and open source software developed by the National Archives of Australia. The DPSP is a collection of software applications which support the goal of digital preservation. The DPSP comprises:

Xena - Xena stands for XML Electronic Normalising for Archives. Xena converts digital files to standards based, open formats.

Digital Preservation Recorder (DPR) - DPR handles bulk preservation of digital files via an automated workflow.

Checksum Checker - is a software used to monitor the contents of a digital archive for data loss or corruption.

Manifest Maker - Manifest Maker produces a tab-separated list of digital files in a specified location. The manifest includes the checksum, path and filename of each digital file.

PLATO is a web based tool to help librarians, archivists, and curators weigh alternatives and decide which, if any, preservation actions to undertake for a specific set of records.  I had seen it demonstrated at a PLANETS workshop, where some of the PLANETS staff led us through the process of using it. Although I did not use it directly myself during the workshops, the process at the time struck me as a bit complex, and it was noted that in one case where it was used in the past, a group of people required a two day workshop to work through the entire process of constructing a preservation plan for one document type.

The SCAPE project offers an open source infrastructure, as well as a variety of tools and services for the distributed processing of large data sets with a focus on long-term preservation.

As mentioned, there are quite a few  open source diigtal library related softwares out there and in my experience it will be best to pair a couple of the softwares mentioned for your backend (storage, metadata) and front end (display) possibilities to create the best product infrastructure .  

We currently use Dspace for a backend repository  but are now thinking about Hydra and testing Archivematica: an open source digital preservation system: https://www.archivematica.org/en/   Another newer solution that is getting a lot of buzz currently is the Hydra project , a multi-purpose repository solution that has a lot of flexibility for user interfaces and digital asset management http://projecthydra.org/  There will be programming knowledge required in all of these but the newer softwares mentioned use newer methodologies that any programmer will be able to take up with focused effort.  Hydra is commonly used with Blacklight http://projectblacklight.org/   and Stanford is currently doing some very interesting work with Hydra.

 For front end display of items we have been having a lot of success with the open source Omeka platform  http://omeka.org/  which is also fairly intuitive and also flexible for working with various other softwares  We have been pairing this up with our Dspace backend.  

Here's a couple examples of projects that we've recently carried out in the past year using the last stated software combination pairing : http://exhibits.library.txstate.edu/thewittliffcollections/exhibits/show/santiago-tafolla-collection/rev-tafolla

And a larger archival yearbook project: http://exhibits.library.txstate.edu/univarchives/exhibits/show/pedagog

I should also note Islandora has been getting a lot of attention as a one stop solution: http://islandora.ca/  It combines the open source softwares: Fedora (backend), Drupal (Front End Content Management system) and Solr (Index) to create a best practices framework.  All of these described above are open source.

There is a big open source software community in the german-speaking area called "Goobi" which is open for international partners of course.

Goobi supports the whole digitization workflow. Goobi makes digitization projects and workflow management possible for large and small libraries, archives, museums and documentation centers. The Goobi open source software is flexible, allowing users to model, manage and supervise freely definable production processes.

Zeutschel, Intranda and other corporations are part of the community and provide a full-service-solution based on openness principles. The website is available in English.

A module for longterm preservation in cooperation with Ex Libris Rosetta will follow soon.

http://www.goobi.org/en/