Place Order Without Payment for WooCommerce will allow users to place orders directly without payment.

Approve Orders for WooCommerce adds an order approval workflow to your WooCommerce store, giving you greater control over order processing.

Ultimate Pre-Orders Plugin for WooCommerce.

Just another product stock status for your WooCommerce store.

Free pre-order plugin for WooCommerce. Allow people to place pre-orders before the products are available to the public

WooCommerce Store owner needs to approve order before payment is processed.