SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.

BaseX Main Repository.

Command line tool to download and extract data from HTML/XML pages or JSON-APIs, using CSS, XPath 3.0, XQuery 3.0, JSONiq or pattern matching. It can also create new or transformed XML/HTML/JSON documents.

eXist Native XML Database and Application Platform

The MarkLogic Data Hub: documentation ==>

XPath/XQuery 3.1 interpreter for Pascal with compatibility modes for XPath 2.0/XQuery 1.0/3.0, custom and JSONiq extensions, pattern matching, XML/HTML/JSON parsers and classes for HTTP/S requests

XSpec is a unit test and behaviour-driven development (BDD) framework for XSLT, XQuery, and Schematron.

Deployment tool for MarkLogic applications. Also provides optional unit test and XQuery MVC structure

Erlang XQuery 3.1 Processor

Java client for the MarkLogic enterprise NoSQL database

An XQuery test framework for MarkLogic

Query processor with proven optimizations, ready to use for your JSON store to query semi-structured data with JSONiq. Can also be used as an ad-hoc in-memory query processor.

An implementation of XPath 3.0 in Objective-C/Cocoa

Exercises for the XQuery Workshops at XQuery at DH2017

Web application framework for XSLT and XQuery developers

A web-based XQuery IDE for eXist-db

A list of great articles, blog posts, and books for learning XQuery

XQuery API for RESTful Web Services. A RESTXQ Implementation for MarkLogic Server.

XML/Document DB on top of distributed cache

A node.js client for the BaseX server.