wooassist

This plugin displays the quantity field on the shop page of WooCommerce stores so customers can change the quantity before adding to cart.

Quantity Field on Shop Page for WooCommerce

This plugin displays the quantity field on the shop page of WooCommerce stores so customers can change the quantity before adding to cart.

B Hays

Limit the display of product fields with Gravity Forms based on the number of entries.
Currently only works for single product fields with a quantity defined. Limit does not count against entries in the trash.
Great for event registration or product quantity limiting.
Built with Better Inventory with Gravity Forms from Gravity Wiz 
http://gravitywiz.com/better-inventory-with-gravity-forms/

Gravity Forms Quantity Limiter

Limit the display of product fields with Gravity Forms based on the number of entries.

Quantity Field on Shop Page for WooCommerce vs Gravity Forms Quantity Limiter