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).
make3_80-sh is a compatibility layer for GNU make 3.80. Starting with 3.81, GNU make treats backslash newlines in commands in a POSIX-compatible way. This breaks older Makefiles. make3_80-sh is a compatibility layer to use old Makefiles with GNU make 3.81. It also aids migration of such Makefiles.