VOGSY - Professional service automation tool built on Google G Suite
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Office Timesheets - Professional Services Automation
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
HarmonyPSA - HarmonyPSA - Professional Services Automation (PSA) for IT Businesses
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.