Fuzzynote is described as 'Terminal-based, hyper-fast, CRDT-backed, collaborative note-taking tool' and is a Note-taking Tool in the Office & Productivity category. There are more than 100 alternatives to Fuzzynote for a variety of platforms, including Windows, Mac, Android, iPhone and Online / Web-based. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Microsoft OneNote. Other great apps like Fuzzynote are Obsidian (Free Personal), Google Keep (Free), Simplenote (Free, Open Source) and CherryTree (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.