Take credit card payments directly on your checkout using PayPal Pro.

The PayPal Express gateway for WooCommerce lets users skip the WC checkout and use PayPal instead.

Cost Calculator is a simple but flexible Quote/Cost calculation plugin. It utilises jQuery and PHP so it has a light footprint on your web servers back end and front end.
This plugin comes with a wide array of options including the ability to create complex click formulas with data information on your buttons. You'll receive full documentation which explains all options.