KeyNote NF Alternatives for Linux

Zim is a graphical text editor used to maintain a collection of wiki pages.

Joplin is an open-source free note taking and to-do application.

wikidPad different from other notepad applications is the ease with which you can cross-link your information.

CherryTree is an hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

NixNote is an open source client for Evernote.

KeepNote is a note-taking and organization. KeepNote is a note taking application that works on Windows, Linux, and MacOS X.

BasKet Note Pads is a KDE program for organizing, sharing, and taking notes.

WizNote is a cross-platform cloud based note-taking client.

Piggydb is an open source Web notebook application that provides you with a platform to build your knowledge personally or collaboratively.

TreeSheets is a free form data organizer.

Leanote is a self-hosted note taking app.

QOwnNotes is a free open source (GPL) plain-text notepad with markdown support and todo list manager for GNU/Linux, MacOS and Windows, that (optionally) works together with the notes application of ownCloud or Nextcloud.

myBase is a unique free-form database software that allows entry of unstructured text, webpages, images, documents, emails and even arbitrary files.

NoteCase Pro is to quickly capture, organize, protect, access, and recycle your information.

Elephant is a notetaker with a classic interface.

footnote is a very light and neat Notebook App for elementary OS.