MacClade at 25, now available free

MacClade is one of the most popular computer tools for phylogenetics today. It's commonly used for editing data sets and analyzing phylogenetic trees, though it can't be used itself for inferring trees. It recently celebrated its 25th birthday, and has been available for free online since 1 May. It will no longer be supported on the upcoming version of MacOS ("Lion") so the Maddison brothers, who authored the program, suggest using Mesquite instead, which is also developed by them.