'Desk Task', and 'Oracle Embedded Database'

Desk Task

DeskTask connects to Microsoft Outlook and displays your calendar and task items on the desktop. Your tasks will always be visible, saving precious time to launch or switch to Outlook. Just minimize every window, and see what are the items due for today or tomorrow. DeskTask displays the whole week so you can be prepared to organize your work. Besides the calendar items, the Outlook to-do list (Folder Tasks) is also displayed. If you work with Outlook, DeskTask is for you.

http://www.carthagosoft.net/

Oracle Embedded Database

Oracle Berkeley DB is a family of open source embeddable databases that allows developers to incorporate within their applications a fast, scalable, transactional database engine with industrial grade reliability and availability. As a result, customers and end-users will experience an application that simply works, reliably manages data, can scale under extreme load, but requires no ongoing database administration. As a developer, you can focus on your application and be confident that Oracle Berkeley DB will manage your persistence needs.

http://www.oracle.com/database/berkeley-db/index.html