Phylografter: collaborative phylogenetic tree assembly
A web2py-based application that lets you combine source trees from published literature into large "megatrees." I developed this as part of a collaborative effort to understand ecological communities and functional traits of plants at a large phylogenetic scale, and used it successfully to graft together a tree of over 14,500 species of land plants, with every node in the grafted tree mapping directly back to a node in a published tree.