solidDB - Relational Databases
Archive2Azure - Archive360's email archive solution retains your data in your own cloud tenant. Say NO to proprietary email archive software that own your encryption keys.
VistaDB - VistaDB is an all-in-one embedded database software for.Net that is completely compliant with ADO.NET providing support for the entity framework.
SQLite - SQLite Home Page
EXtremeDB - EXtremeDB is an extensive database management software that is creating an impact via extracting the actionable data for the predictive insight that, in turn, values the entire infrastructure.
MySQL - The world's most popular open source database