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JavaDBConnector is a Java API for connecting to the four most popular database engines: MySQL, MS SQL Server, Oracle and MS Access. Includes a customizable GUI for connections managing and a generic logic tier for make easy to use databases,
sqlWizz is a lightweight database client written in Java (swing-based). Works with any database that has a jdbc driver. Accepts multiple concurrent connections to different databases and has i18n support.
Skwish is a fast, simple, lightweight Java library for storing blobs on the file system. It allows multiple concurrent readers and writers, provides all-or-nothing write semantics, and is designed to survive abnormal, unclean shutdown.
...If you need a persistent hash map, this is for you. It is basically as fast as it gets without caching, but doesn't offer any non-basic features like transactions or concurrent access.
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A small database stress tool written in Java. Emulates a given number of concurrent users querying the engine. Reports timing information for each test. Currently supports MySQL engine only.
QueryForm is a Java/Swing-based GUI app which provides a powerful form-based front end for relational databases. It supports multiple concurrent connections to different databases. Query results can be exported to CSV files or INSERT statements.
BITS is a Bug Identification and Tracking System. It is similar to Bugzilla in concept but has an unique design and workflow. BITS support multiple concurrent projects, small or large and is currently targeted at corporate-like environments.
LeverPack is a small, transaction based, secure, concurrent, and efficient record repository management engine written in Java. It provides READ_COMMITTED transaction isolation level supported read/write access to user data records.
The cache-optimized concurrent skip list is a set of algorithms for maintaining dynamic ordered mappings. Top-down balancing algorithms minimize cache-misses while using a per-node read-write spinlock to coordinate shared access. Designed for Linux 2.4.