SSuite NoteBook Editor is described as 'free portable text editor that has all the functionality to start you on writing that important novel, short-story or article, with enough bells and whistles to help out' and is a Word Processor in the Office & Productivity category. There are more than 100 alternatives to SSuite NoteBook Editor for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and iPhone. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try LibreOffice - Writer or Google Docs. Other great apps like SSuite NoteBook Editor are Notion (Free Personal), Typora (Paid), Microsoft Word (Paid) and Manuskript (Free, Open Source).
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.