VOGSY - Professional service automation tool built on Google G Suite
4D - 4D is a relational database management system and IDE.
Office Timesheets - Professional Services Automation
Informix - IBM Informix is a secure embeddable database optimized for OLTP and IoT data. Informix can seamlessly integrate SQL, NoSQL/JSON, and time series and spatial data.
HarmonyPSA - HarmonyPSA - Professional Services Automation (PSA) for IT Businesses
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...