TreeNoote is described as 'brand new note-taking program, free, secure and available in a portable version' and is a Note-taking tool in the office & productivity category. There are more than 100 alternatives to TreeNoote for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Google Keep. Other great apps like TreeNoote are Notion, Microsoft OneNote, Simplenote and CherryTree.
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.