TreeTime is described as 'Lets you organize notes, tasks, and projects using linked hierarchical trees. Perform recursive calculations on your data and explore your information visually through a lightweight, view-only local web interface — all while keeping your data private and portable' and is a todo list manager in the office & productivity category. There are more than 100 alternatives to TreeTime for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best TreeTime alternative is Obsidian, which is free. Other great apps like TreeTime are Joplin, ONLYOFFICE, Logseq and Anytype.