GATE (General Architecture for Text Engineering) is free, open source software offered by the University of Sheffield since 1995. It provides a framework for users to gather a corpus, apply an ontology to it, develop markup, automate the application of the markup to the corpus and add tools such as knowledge facet search, ontology browsing or graphing.
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More information on GATE and its development is available in the following article:
Cunningham, Hamish. \"GATE, a General Architecture for Text Engineering.\" Computers and the Humanities 36.7 (2002): 223-254. Web.
GATE also appears in Project Bamboo's DiRT, a registry of digital tools suitable for academic research. DiRT contains a wide range of tools and software searchable by task, such as annotation, content management, collaborative research, or authoring. It is an excellent resource for Digital Humanists seeking the right tool for the task at hand.
View GATE in DiRT:
http://dirt.projectbamboo.org/resources/gate
View the full site:
http://dirt.projectbamboo.org/
Gate was used in these research abstracts https://dh2016.adho.org/abstracts/146
https://dh2016.adho.org/abstracts/48