Name some typical WAF / WAAP products and the kind of offering each is.

Question

Accepted Answer

Akamai as a cloud WAAP provider; Imperva as a web application firewall / WAAP; AWS WAF for websites and APIs; Azure Web Application Firewall; Google Cloud Armor WAF.
The list spans the deployment variants: Akamai is a content-delivery network that filters traffic at its edge before it reaches the customer's servers; Imperva offers WAFs both as a cloud service and on-premises; AWS WAF, Azure WAF and Google Cloud Armor are WAFs integrated into the respective cloud platforms, switched on in front of the provider's load balancers, gateways or CDN. The architectural choice is usually less about which product is "best" and more about where the web servers already run.
Go deeper:

Akamai — App and API security — an edge-based WAAP offering (German page).
 Imperva — Web Application Firewall — a WAF sold both as a cloud service and on-premises.
 AWS WAF — a WAF integrated into the AWS platform for websites and APIs.