Quill - Write on every Mac ever made.
One document, from a 1986 Macintosh Plus to your iPhone - synced,
versioned, private. Quill runs natively on classic Macs (System 7
to Mac OS 9), on macOS, iPhone and iPad, and in the browser.
Quill's web edition needs JavaScript. If this is a classic Mac,
the native client is what you want:
Download Quill for Classic Mac OS.