||This article has an unclear citation style. (April 2010)|
||A major contributor to this article appears to have a close connection with its subject. (August 2010)|
|Stable release||4.13.2 / April 30, 2014|
|Operating system||Microsoft Windows (32 and 64-bit), Mac OS X (Intel, 32 and 64-bit), Linux (32 and 64-bit)|
|License||Proprietary commercial software|
AllegroGraph is currently in use in Open source projects, commercial projects and Department of Defense projects. It is also the storage component for the TwitLogic project that is bringing the Semantic Web to Twitter data.
AllegroGraph was developed to meet W3C standards for the Resource Description Framework, so it is properly considered an RDF Database. It is a reference implementation for the SPARQL protocol. SPARQL is a standard query language for linked data, serving the same purposes for RDF databases that SQL serves for relational databases.
The company that makes AllegroGraph, Franz, Inc., made its reputation with its Allegro Common Lisp implementation of Common Lisp, a dialect of Lisp (programming language). The functionality of AllegroGraph is made available through Java, Python, Common Lisp and other APIs.
The first version of AllegroGraph was made available at the end of 2004.