Zim is a notebook type software - think Evernote or Onenote. However, it’s free and open source and saves data locally. It also saves all files as plain text, so you can access the files however and wherever you want. I’ve been using it for a journal for a period of about three years now and I’ve written about it before. I did for a time switch back to Day One and tried the new syncing service, but when they had syncing issues earlier this year which exposed private data, I made sure I was back using Zim (syncing between my devices with Resilo Sync and stored on my own devices).