I found this application back in 2010. I was searching for a mind mapper at the time. It allows pretty high complexity but is so simple to use. It has a very s

I found this application back in 2010. I was searching for a mind mapper at the time. It allows pretty high complexity but is so simple to use. It has a very short learning curve. You can be doing meaningful work with it in a matter of minutes. It has features of a spreadsheet that allow you to store related info and do math on fields but is so much more useful because you can do the math at one level and use layers below to completely document why and how you did it that way, where the values come from etc. even linking to local references for inputs, outputs, logs, etc. I have used it in data processing to thoroughly document data input and output creation; for detailed vacation itineraries; as a password manager; for genealogy research; address and contact management for personal and business contacts, etc. There are so many things that can be managed using Treesheets.