ACOPOST is a set of freely available POS taggers modeled after well-known techniques. The programs are written in C (aiming for extreme portability and code correctness/safety) and run under various Unix flavors (and probably even under Windows). ACOPOST currently consists of four taggers that are based on different frameworks: Maximum Entropy Tagger (MET), Trigram Tagger (T3, based on Hidden Markov Models), Error-driven Transformation-based Tagger (TBT or Brill Tagger), and Example-based tagger (ET).
SISVENTI is a point of sales system for small businesses. It includes warehouse management, payable accounts, and receivable accounts, a curses-based sales interface, and a Web based administration/operation interface for fast input. Its goal is to offer simplicity and flexibility for any business, without complex processes.