FLAT is a web-based linguistic annotation environment based around the FoLiA format (http://proycon.github.io/folia), a rich XML-based format for linguistic annotation. FLAT allows users to view annotated FoLiA documents and enrich these documents with new annotations, a wide variety of linguistic annotation types is supported through the FoLiA paradigm. It is a document-centric tool that fully preserves and visualises document structure.
FLAT is open source software developed at the Centre of Language and Speech Technology, Radboud University Nijmegen. It is licensed under the GNU Public License v3. The project is funded in the scope of the larger CLARIAH project.