CMap Tools have been significantly updated to version 6.02. See the site and updates here with lits of use demonstrations. " .... Cmap software is a result of research conducted at the Florida Institute for Human & Machine Cognition (IHMC). It empowers users to construct, navigate, share and criticize knowledge models represented as concept maps. ... " Site and downloads here. License is free for commercial use. Easy to use and learn, Cloud based. Works on many platforms and iPad.