In case that you don't know, TNT is the most faster program for phylogenetic analysis under parsimony, implements several new and efficient heuristic algoritms [1,2], and a powerful script/macro language. If you are doing cladistics/phylogenetics, you should surely dream with this program!
I love the matrix editor! Is easy to use, and more straightforward than WinClada, NDE or Mesquite (yep!... far better than mesquite!).
You could download it at: http://www.zmuc.dk/public/phylogeny/TNT/
read the license agreement and enjoy :)
 Nixon, K.C. 1999. The parsimony ratchet a new method for rapid parsimony analysis. Cladistics 15: 407-414.
 Goloboff, P. A. 1999. Analyzing large data sets in reasonable times: solutions for composite optima. Cladistics 15: 415-428.