Centralize, transform and stash your data
Get random, realtime read/write access to your Big Data
Apache IoTDB
Infinispan is an open source data grid platform
An open source SQL database designed to process time series data
TypeDB: a strongly-typed database
Free database schema discovery and comprehension tool
General-purpose bitemporal database for SQL, Datalog & graph queries
DBMS supporting graph, document, full-text and geospatial models
Distributed database ecosphere
Database Replication, Filtered Synchronization, and Transformation
A Java SQL client for any JDBC compliant database
Database Subsetter and Relational Data Browser
Toolkit for working with and mapping geospatial data
A Database System for Metamodeling and Method Engineering
DAO for all database server types with the Java POJO code generator
Version Control for your Database
Common Resource Grep
eXist-db is a feature rich Open Source native XML database
Fast comparer for database data in the key predefined tables
Database file mapping names to records, implementing a file-system
elementary database files for Java, B+ tree index files, ISAM
Open Source and data mining software
World's first open source data quality & data preparation project