treesheets 20160518~git2fe021f4-1 (s390x binary) in ubuntu yakkety

 Suitable for any kind of data organization, such as Todo lists, calendars,
 project management, brainstorming, organizing ideas, planning, requirements
 gathering, presentation of information, etc.
 .
 It shares many characteristics with more familiar tools, and augments their
 abilities - like a spreadsheet, but supporting hierarchical data; like a mind
 mapper, but more organized and compact; like an outliner, but in more than one
 dimension; and like a text editor, but with structure.