izumo 1.10.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is categorized as Productivity Tools. This free Mac application is a product of Daichi Nakajima. We recommend checking the downloaded files with any free antivirus.
From the developer:
Izumo is the simple note tool for markdown only. If you have AppleID, you can share data with various devices. If you use Izumo application specific to macOS application, you can edit and save notes on PC.
All features are available free of charge.
You may want to check out more software for Mac, such as PDFMergeThing, NanoCount or Gordon, which might be related to izumo.