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The dwarf sees farther than the giant, when he has the giant's shoulder to mount on. Samuel Taylor Coleridge, 1828

The development of Postvorta was only possible due to the availability of the following open source libraries:

GATE Mímir
GATE Mímir is a multi-paradigm information management index and repository which can be used to index and search over text, annotations, semantic schemas (ontologies), and semantic meta-data (instance data). It allows queries that arbitrarily mix full-text, structural, linguistic and semantic queries and that can scale to gigabytes of text.
GATE Embedded
GATE Embedded is designed to allow you to embed language processing functionality in diverse applications. In fact this code is probably present in more applications that deal with human language than any other, and this widespread usage and long development history means that it is stable, efficient and comprehensive.
Apache Tomcat
Apache Tomcat is an open source software implementation of the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed under the Java Community Process.
Sitemesh
SiteMesh is a web-page layout and decoration framework and web- application integration framework to aid in creating sites consisting of pages for which a consistent look/feel, navigation and layout scheme is required.
Jawr
Jawr is a tunable packaging solution for Javascript and CSS which allows for rapid development of resources in separate module files. Developers can work with a large set of split javascript files in development mode, then Jawr bundles all together into one or several files in a configurable way.
XSteam
XStream is a simple library to serialize Java objects to XML and back again.
URL Rewrite Filter
Based on the popular and very useful mod_rewrite for Apache, UrlRewriteFilter is a Java Web Filter for any J2EE compliant web application server, which allows you to rewrite URLs before they get to your code.