Thanks so much for asking this question! I too have been trying to gather this information and find it very hard to get a full view of the software landscape for libraries/archives. The resources people have replied with are extremely useful, though I wish LITA or Code4Lib had a comprehensive, user friendly place that devs could easily submit to.
- [CODE4LIB] Master list of open source projects of i... Brad Coffield
- Re: [CODE4LIB] Master list of open source proj... Eric Phetteplace
- Re: [CODE4LIB] Master list of open source ... Joseph Montibello
- Re: [CODE4LIB] Master list of open sou... Erwin Verbruggen
- Re: [CODE4LIB] Master list of open... Gregory Markus
- Re: [CODE4LIB] Master list of open source proj... Brad Coffield
- Re: [CODE4LIB] Master list of open source proj... Alexandra Dolan-Mescal