Excellent

There are a lot of rich text widgets on the WP repository, but this one simply works perfectly.
Many of others embed the WP editor in the widget itself, that seems buggy, sometimes text not displayed in the editor, sometimes the editor is empty.
This plugin adds a custom post named “Widget Blocks”, so you edit your widget content as same as you do with others posts, this gives you the ability to organize your text widgets.
Once in the Appearance > Widgets page, you add your widget and choose the “Widget Blocks” post you want to show. That’s all. That’s simple and neat.