Apache Jackrabbit is a Content Repository fully conforming to JCR specification. Jackrabbit content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more. It provides access to its repository via Web Interface, Command line , WebDAV and RMI. The content could be stored in file system or in database. It supports REST API so that it could be accessed from any programming language.

Apache Jackrabbit is a Content Repository fully conforming to JCR specification. Jackrabbit content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more.

Jackrabbit - Content Repository in Java

JFrog is an universal Artifact Repository Manager on the market, JFrog Artifactory fully supports software packages created by any language or technology. As a local proxy to the outside world, Artifactory guarantees consistent access to the components needed by your build tools. Remote artifacts are cached locally for reuse, so that you don’t have to download them over and over again. Automate all aspects of artifact management using a powerful REST API.


JFrog - Artifact Repository Manager

Lily offers an open source content repository. It is the first cloud-scalable repository for social content applications. It is built from ground up using  Big Data and NOSQL technology. Its technology stack includes Hadoop, HBase and Solr. It could be used in document archiving, large-scale SaaS-model web content management, heritage databases, news libraries, digital asset management, content collections, structured data management.

Lily - Content Repository

Nexus manages software artifacts required for development, deployment, and provisioning. Nexus can share those artifacts with other developers and end-users. It is integrated with Eclipse. It stores the content in the file system and no requirement for database. Full text search support is provided by indexing the repository content. 
 It has ability to proxy Maven repositories. RSS feeds will be generated when ever a new artifacts is added / modified / deleted. Full REST APIs support is provided using Restlet. 
 Source code location: <A HREF="https://github.com/sonatype/nexus" target="_blank">https://github.com/sonatype/nexus</A>

Nexus manages software artifacts required for development, deployment, and provisioning. Nexus can share those artifacts with other developers and end-users. It is integrated with Eclipse. It stores the content in the file system and no requirement for database. Full text search support is provided by indexing the repository content. 

Nexus - Repository Manager

DSpace open source software is a turnkey institutional repository application. It preserves and enables easy and open access to all types of digital content including text, images, moving images, mpegs and data sets.

DSpace - Digital Asset Management

Dryad is a repository for data underlying scientific literature. Dryad allows investigators to validate published findings, explore new analysis methodologies and repurpose the data for research questions unanticipated by the original authors. The core code of Dryad comes from the DSpace repository software. It is a general-purpose repository that makes the data underlying scientific publications discoverable, freely reusable, and citable. 

Dryad - Repository for data underlying scientific publications, based on the DSpace platform

A distributed &quot;no single point of failure&quot; service directory of SOA services which allow clients to easily manage(find, use, publish, monitor, deploy) their services. By using it you increase the number of hot deployments, decrease server load on your services, increase availability of your service response times by using it's internal auto load balancing mechanism. Service repository stores the information about your service. Clients will communicate the repository and fetch the information about your service and then connect using the URL. This avoids the hard coded dependencies to (web/rest)services.

A distributed &quot;no single point of failure&quot; service directory of SOA services which allow clients to easily manage(find, use, publish, monitor, deploy) their services. By using it you increase the number of hot deployments, decrease server load on your services, increase availability of your service response times by using it's internal auto load balancing mechanism.

Service Repository - Service Directory for SOA Services

JeCARS (Java Extendable Contents And Rights System) is a lightweight RESTful webservice which delivers pluggable output formats, e.g. Atom feeds, JSON or HTML. Third party applications can be plugged in. A JCR (JSR-170) repository (Jackrabbit) is used for storage.

JeCARS - Control you content

Eclipse Package Drone is a software artifact repository. A system which stores software packages (like JAR files, Debian Packages, …), extracts information, transforms these and provide access via different repository interfaces.  Package Drone's initial focus was on providing a repository system for the different repository formats (like P2, Maven, OBR and OSGi R5) with a focus on OSGi. Over the time the system was enhanced to allow pluggable adapters for other content types and repository adapters. 

Eclipse Package Drone - Software Artifact Repository 

Strongbox is a modern OSS artifact repository manager. With a well-developed architecture, it provides native implementations for various layout formats, such as Maven, NPM, NuGet, and Raw.

Strongbox - Artifact repository manager.

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