TIARA is provided for free, but it would be appreciated if you could send us a courtesy email so we could survey what kind of tasks the tool is used for. Kindly cite the following paper if you use TIARA in scientific work or if you want to learn more about the tool, please do have a look at

Jan Wira Gotama Putra, Kana Matsumura, Simone Teufel, and Takenobu Tokunaga (2021). TIARA 2.0: An Interactive Tool for Annotating Discourse Structure and Text Improvement. In Language Resources and Evaluation. (pdf) (ris)