AllegroGraph

AllegroGraph is a closed source triplestore which is designed to store RDF triples, a standard format for Linked Data.^[1] It also operates as a document store designed for storing, retrieving and managing document-oriented information, in JSON-LD format. AllegroGraph is currently in use in commercial projects^[2][3][4][5] and a US Department of Defense project.^[6] It is also the storage component for the TwitLogic project^[7] that is bringing the Semantic Web to Twitter data.^[8]

AllegroGraph

Developer(s)	Franz Inc.
Stable release	7.3.1 / December 20, 2022; 2 years ago (2022-12-20)
Written in	Java, Python, Common Lisp
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
Website	allegrograph.com

Implementation

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.^[9] SPARQL is a standard query language for linked data, serving the same purposes for RDF databases that SQL serves for relational databases.^[10]

Franz Inc. is the developer of AllegroGraph. It also develops Allegro Common Lisp, an 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.^[11]

The first version of AllegroGraph was made available at the end of 2004.^[12]

Languages

AllegroGraph has client interfaces for Java, Python, Ruby, Perl, C#, Clojure, and Common Lisp. The product is available for Windows, Linux, and Mac OS X platforms, supporting 32 or 64 bits.^[13]

For query languages, besides SPARQL, AllegroGraph also supports Prolog and JavaScript.^[14]