There are many free cloud notebook tools on the internet, but if you need to use advanced features or expand the usage limits, you need to pay extra. In addition, some private data is also worried about leaks, and also worried about the risk of data loss when the service ends. Laverna is an open source free notebook tool that supports multi-platform synchronization Windows, Mac, Linux. You can save it on your computer or back up to your own cloud space, or you can use tools like Dropbox to do synchronous backups, and there is a Traditional Chinese version, which can be used without installation and directly executed, suitable for people who take notes casually. If you can't view it, you can refer to.此頁的介紹