remm

This plugin provide widget that display a list with categories and posts in your sidebar. 
Widget can save the opened categories, and use cache.

Wp Ajax Tree

This plugin provide a widget that display a category and pages tree on your sidebar, using ajax to collapse categories.

soandso

denispishniak

Woo Products Tree is a simple plugin which adds a widget displaying navigation tree of products and categories on your WooCommerce store.
Widget opens current product category and highlights viewing product there. Allows customer open and close other categories in tabs and directly go to the item of interest.
Widget can shows or hide price, product image, put images to the right or to the left side from the products list. For best site color combination widget provides adjustment its main color.
Only two levels of categories inserts available in current free version. 
If you like and need in this product, please support us how it possible, then we will continue creation. Thank You!

Woo Products Tree

Plugin instals a widget of product navigation tree .

Wp Ajax Tree vs Woo Products Tree