A graph database that supports more than 100+ billion data
CDC Connectors for Apache Flink
The open big data serving engine
Cloud Database Manager
RisingWave: the next-generation streaming database in the cloud
Easy to use open source fast database for search
Toolkit for working with and mapping geospatial data
A Java SQL client for any JDBC compliant database
A powerful, cross platform, SQL database system
Relational Database
An object relational-mapping (ORM) library for Java
a set of foundation classes for database engines
Database Subsetter and Relational Data Browser
A generator of DTO, Model, and DAO classes to access relational DB
Database Replication, Filtered Synchronization, and Transformation
DAO for all database server types with the Java POJO code generator
Java persistence using JDO, JPA or REST
Deductive Database with Datalog, SQL, RA, TRC, DRC
RAD Tool and IDE for PHP, JSP, ASP, C++ and Java Swing
ORBIT : Operating Business Intelligence Tool
Relative Examples and Resources of iBoxDB, etc...