Fuel Meals - https://www.fuelmeals.com/

1 - Custom side cart

2 - Checkout customizations (Hidden line item properties)

3- Custom Meal plan feature ( Weight loss and muscle gain plans: customer selects a plan and products are automatically added after selection)

4- Recharge Bundles - It seems like that simple products are being added to the cart but custom code creates a bundle at the backend in recharge.

5- Toggle button and Frequency update buttons - Customer can update the frequency of the line items after adding them to the cart or can remove subscriptions from the cart.

6- Less than 7 products can't be purchased.

7 - Customized Recharge customer portal to manage subscriptions