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Copyfree Works

The license status of some works may be more complex than it at first appears here. In some cases, the license status listed for a given work is the "primary" license under which it is distributed. In several cases, parts of the work may be distributed under other licenses -- potentially even non-copyfree licenses.

Where present, descriptions are typically drawn from the claims of the projects themselves, and represent neither claims nor opinions of the Copyfree Initiative. Inclusion here (with or without description) does not constitute, and should not be inferred as, endorsement of any project.

Listings are presented for informational purposes only, and no representation is made as to the accuracy or utility of any information provided. Use at your own risk.

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Bucardopermalink

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check_postgrespermalink

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Hyperdexpermalink

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HyperDex is a next generation key-value store with a rich API, strong consistency, and fault tolerance -- providing strong guarantees to applications that are not matched by other NoSQL systems.

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influxdbpermalink

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KeyDB [1] [2]permalink

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KeyDB aims to be the fastest in-memory database in the world, as well as highly scalable, with high throughput, all with high availability and support for a variety of data structures.

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kvrockspermalink

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The kvrocks database is an open-source key-value database which is based on rocksdb and compatible with the Redis wire protocol, intended to decrease memory cost and increase the capability compared to Redis.

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Lemurpermalink

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The Lemur Project develops search engines, browser toolbars, text analysis tools, and data resources that support research and development of information retrieval and text mining software. The project is best known for its Indri search engine, Lemur Toolbar, and ClueWeb09 dataset.

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LevelDBpermalink

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LevelDB is a fast, on-disk, ordered mapping key-value storage library.

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libpqxxpermalink

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Lightning Memory-Mapped Database [1] [2]permalink

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LMDB is a Btree-based database management library modeled loosely on the BerkeleyDB API, but much simplified.

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Mediachainpermalink

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Mediachain serves the role of a traditional database, but is a decentralized, global data layer for powering serverless applications. It is a single port of entry for applications and users to publish, discover, and collaborate on data.

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memcached [1]permalink

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The memcached project provides a high-performance, distributed memory object caching system, generic in nature but intended for use in speeding up dynamic web applications by alleviating database load.

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pgsipermalink

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PostgreSQLpermalink

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PostgreSQL Blockchain Extensionpermalink

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PostgreSQL Blockchain Extension is a C language Postgres extension that provides Bitcoin blockchain functionality.

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Redispermalink

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Redis is an open source, in-memory data structure store, used as a database, cache, and message broker, with built-in replication, transactions, and various levels of on-disk persistence.

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Slony-Ipermalink

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SOCIpermalink

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SOCI is a database access library for C++ that gives the illusion of embedding SQL queries in regular C++ code, staying entirely within Standard C++.

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sqlboxpermalink

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The sqlbox project allows SQLite3 database access within a file-constrained application process (typically as enacted with pledge(2) on OpenBSD) via a separate process with file-system access.

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SQLitepermalink

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Tarantoolpermalink

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Tarantool is an in-memory computing platform with a flexible data schema, commonly used for creating high-performance applications.

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TinyCDBpermalink

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TinyCDB is a very fast and simple package for creating and reading constant databases (a data structure introduced by Dan J. Bernstein in his cdb package).

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