LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Worksnaps - Worksnaps is a unique service specifically designed to track time for remote workers, telecommuters and freelancers.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
OfficeTime - OfficeTime is a time and expense keeping utility for Mac, PC, iPhone and iPad. We also offer invoicing and reporting in an easy to use UI.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
TimeStatement - A simple time & expense tracking software with powerful invoice & report generation, best Excel alternative / extension, timesheet...