TreePad is described as 'A free and lightweight outliner, only 465KB in size. It allows you to store all your notes, emails, texts, hyperlinks, etc. into one or multiple plain-text databases. With the look and feel of the familiar Windows Explorer, editing, storing, browsing, searching, and retrieving' and is a Note-taking tool in the office & productivity category. There are more than 50 alternatives to TreePad for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best TreePad alternative is Notesnook, which is both free and Open Source. Other great apps like TreePad are Zim, CherryTree, TiddlyWiki and ToDoList.