This is a fairly new plugin trying to compete with the big players like Elementor or SiteOrigin. The problem we have with Elementor is that it gets quite heavy on resources in the dashboard. Pages created with Elementor take too long to edit and save, although they work fine in the front-end. SiteOrigin, on the other hand, has its limits in terms of layout options and design.
Contrary to this, Nimble is fast and easy to use and integrates nicely with the WordPress customizer, which also gives you real-time previews of the changes. It has many modules, which allow you to customize your layout and the results can be truly amazing even for less skilled website owners. Currently, it is being used by only 40,000 WordPress websites.