Calypso by WordPress.com

Calypso is a piece of software developed by the WordPress.com guys. It's a desktop-based blogging tool. You can download it for free from https://apps.wordpress.com/desktop/. There are versions for both Windows and Mac available. Calypso works similarly to any other software that you happen to have on your computer right now. After you install it, you can log in to your WordPress.com account, and then manage all your websites that are hooked up to that WordPress.com account from within the Calypso software.

The tool itself is very easy to use and very efficient. However, it does require a live internet connection to work. Think of it as an alternative way of accessing your WordPress.com account, via your desktop instead of a web browser. The user interface itself looks exactly like your dashboard at the WordPress.com website.

To learn more about Calypso and how to use it, you can visit this in-depth guide: https://premium.wpmudev.org/blog/calypso-tour/.