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Datalevin is an open-source Datalog-based database written in Clojure that runs natively on top of LMDB. It supports full ACID transactions, schema-less EDN data storage, vector search with SIMD acceleration, and text-based querying. Usable as an embedded library or as a client/server database with RBAC access, it acts like SQLite or Datomic on a ledger of immutable datoms, plus modern features like vector and full-text search.

...It's written in Java and it's amazingly fast. No expensive run-time JOINs, connections are managed as persistent pointers between records. You can traverse thousands of records in no time. Supports schema-less, schema-full and schema-mixed modes. Has a strong security profiling system based on user, roles and predicate security and supports SQL amongst the query languages. Thanks to the SQL layer it's straightforward to use for people skilled in the Relational world. OrientDB adheres to the NoSQL movement even though it supports ACID Transactions and SQL as query language. ...

Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud. Due to its light-weight architecture, high performance and rich feature set together with its deep integration with Apache Hadoop, Spark and Flink, Apache IoTDB can meet the requirements of massive data storage, high-speed data ingestion and complex data analysis in the IoT industrial fields. In the scene of factories, there...

Moelnir is a basic database file, addressing variable record data through integer identifiers, which applies heap organisation of its data space. Advantage of Moelnir is that each record is stored in a continuous segment on the file while still record size is limit-less variable and modifiable. There are no data length limits other than the range of a 63-bit unsigned integer. Scalability is limited to 1 - 10 Mio. entries due to non-paging internal structures.

JetBrains Xodus is a transactional schema-less embedded database that is written in Java and Kotlin. It was initially developed for JetBrains YouTrack, an issue tracking and project management tool. Xodus is also used in JetBrains Hub, the user management platform for JetBrains' team tools, and in some internal JetBrains projects. Xodus is highly concurrent. Reads are completely non-blocking due to MVCC and true snapshot isolation.

Java Ultra-Lite Persistence (JULP): RDBMS independant Object-Relational library. Inheritance, many classes per table, many tables per class, optimistic concurrency, simple mappings, etc. Less then 350KB. GUI to generate classes and mappings.

Java Objects Persistence Service (JOPS) is a simple and very useful library dedicated to developers who don't need all the power of traditional DBs (MySQL,Oracle.etc) but still need to be able to persist and manipulate their persisted objects easily

jMighty is a simple and powerful database framework and connection pool management library. It enables to do all database activities and can be used in standalone and server applications. Learning the library took less than five minutes.

2 Java frameworks with transient and persistent object models based on nonstandard approach (less evident but faster development): an object is a set of named fields. 3 non-object libraries simplifying access to tables stored in RDB, text files, etc.

XTEA (eXtended Tiny Encryption Algorithm) support for db4o open source object database. XTEA is a block cipher that operates on a 64-bit block size with a 128-bit key. An extremely tiny but very fast encryption algorithm (with cycles less than 32 rounds)

Hospital OS is a hospital information system for small-sized hospitals (100 beds or less, 200 out-patients per day or less). Hospital OS was developed for the healthcare system of Thailand targeting its small community hospitals nation-wide.

Automotive Quality complaint Management to record Customer incident with all data, including reporting and easy serching. It is designed to use for technically automotive Customer complaints and to use as less screens as possible.(Automobil Reklamation)

Persitancy api simaler to Prevailer but with more transparancy and less intrusiv to how you can disign your data structure. It uses a bytecode enhancer to add needed code to have your object presited betwhen sessions.

JDBCFacade is a library for making JDBC easier to use and less error prone while encouraging a clean separation between persistence and domain logic. Unlike many similar tools, JDBCFacade does not interfere with the normal usage of JDBC in any way.

This project tries to define a new grammar to be used for database access. It should be easier to learn, understand and use than SQL, be more consistent, and contain significantly less rules. It does not try to be an extension or subset of SQL.

SQLProcessor is a facade for parts of the JDBC API. JDBC is used, but with an interface that hides the repetition and complexity. We have found SQLProcessor code can be quicker to write, less error prone, and more amenable to reuse.

FORAN is an easy to use database webfrontend based on JSP, JAVA and Tomcat. It supports (mor or less ;) ) ORACLE, SAP-DB

J2EE based database access; an alternative to Entity EJBs that allows for much higher performance, easier use, less coding, more dynamic, and more tuned to use with a web presentation layer (such as Tapestry).