LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Thexyz - Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
ZixArchive - ZixArchive is a cloud-based solution to collect, store and search archived emails.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
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.