This is ACOPOST, "A COllection of POS Taggers". Part-of-speech tagging is the task of assigning symbols from a particular set to words in a natural language text. ACOPOST implements and extends well-known machine learning techniques and provides a uniform environment for testing. Originally written by Ingo Schröder, ACOPOST is now maintained by a team of developers, and has a home at: http://acopost.sourceforge.net/ Enjoy! - The maintainenance team