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4D - 4D is a relational database management system and IDE.
ESM Tools - ESM Tools is a powerful and widely known software development platform that comes with a centralized model infrastructure, providing the common frame for compiling, running, downloading, and organizing models (ones or multiple).
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
H2 Database - H2 is free SQL database written in Java
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.
Amazon RDS - Easy to manage relational databases optimized for total cost of ownership.