Microsoft SQL
MySQL
PostgreSQL
Oracle Database 12c
Oracle DBaaS
SQLite
SAP HANA
Software AG webMethods
BiblioteQ
TinyCat
FOLIO
Evergreen ILS
DSpace
Greenstone Digital Library
Invenio
Omeka
Microsoft SQL
BiblioteQMySQL - The world's most popular open source database
TinyCat - The online catalog and integrated library system for tiny libraries, powered by LibraryThing.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
FOLIO - Simple version control app for designers based on Git
Oracle Database 12c - Simplify database management and automate the information lifecycle with maximum security.
Evergreen ILS - Evergreen - Open Source Library Software