Apache IoTDB
Database connection pool written in Java
Database subsetting and relational data browsing tool
Leading open-source visualization and observability platform
MyBatis SQL mapper framework for Java
A graph database that supports more than 100+ billion data
Toolkit for working with and mapping geospatial data
Chess Database and Toolkit program
A Java SQL client for any JDBC compliant database
An object relational-mapping (ORM) library for Java
Relational Database
A powerful, cross platform, SQL database system
ORBIT : Operating Business Intelligence Tool
Database Subsetter and Relational Data Browser
A Database System for Metamodeling and Method Engineering
A generator of DTO, Model, and DAO classes to access relational DB
The modern AI‑first database client for developers DBAs and analyst
Java persistence using JDO, JPA or REST
DAO for all database server types with the Java POJO code generator
Relative Examples and Resources of iBoxDB, etc...