Berkeley DB Java Edition is a high performance, transactional storage engine written entirely in Java.
Main features:
- Stores data in the application's native format, so no runtime data translation is required.
- Database architecture supports very high performance and concurrency for both read-intensive and write-intensive workloads.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.