An extremely easy way to perform background processing in Java
DBMS supporting graph, document, full-text and geospatial models
Active, high-performance open source database middleware
CrNiCKL (chronicle) is a Java database for time series
giServer the easy to use and extensible batch and integration server
Simple Workflow is a free workflow engine written in Java.
Enterprise Content Management System
ChronoDB is a data manager for generic time series.