bookxnote

The bookxnote software is known as MarginNote on the windows platform, and the most important thing is that it is free.
I hope there will be a portable version that can be used by more people and in more scenarios.

Due to insufficient language proficiency, Google Translate was used for the above content. Please forgive me if there are any inaccuracies in expression.

Request the download address of the main program to create a portable version: http://www.bookxnote.com/