From the website:
Texifter personnel created the Public Comment Analysis Toolkit. PCAT is Web-based, university-hosted software engineered for the specific task of reviewing public comments submitted via the Federal Docket Management System. PCAT is actually version 2.0 of the Coding Analysis Toolkit (CAT), therefore it is also useful for sorting all kinds of CAT-style datasets. If you have lots of digitized text, you can form a team of peers, create a project, upload data, discover important themes and issues, and organize your analysis with PCAT. This system is the end product of ten years of NSF-funded public comment classification work by Dr. Stuart W. Shulman, who has published numerous peer-reviewed papers on the subject.