Treeline [1] is a mind mapping tool that helps users apply order to the chaotic task of data collection. The Python-based Treeline relies on PyQt [2].

Treeline organizes data in a tree structure. Each element (or node) in the tree can contain an arbitrary number of data fields of different types. There is no restriction to the number of nodes. Various sorting functions help users search the data collection. The program focuses on structured management but also provides print and export functions that let users convert their data into a variety of formats.