TOAST UI Editor
Tiki25 offers support for https://github.com/nhn/tui.editor in conjunction with Tiki-Flavored Markdown.
TOAST UI Editor 3.0 is based on ProseMirror
Enhancements to watch out for
- https://github.com/nhn/tui.editor/issues/2159
- https://github.com/nhn/tui.editor/issues/2321
- https://github.com/nhn/tui.editor/labels/Enhancement