SilverBullet+ is a version of SilverBullet that is installable as a desktop app for macOS, Windows and Linux. While SilverBullet+ is not open source software, it is free to use for personal and education use.
The goal of the project is to provide a smoother desktop experience, and act as a sustainable source of Funding of the SilverBullet project in general. It is created and maintained by Zef Hemel, just like the open source project. It works great in combination with a SilverBullet server (e.g. for sync).
You can download SilverBullet+ here.