Divi, an integrated multi purpose theme and page builder. Ideal for agencies with it's generous lifetime deal an unlimited sites use.

One of the most popular page builders around, helped by decent support, ease of use, and a not too restrictive free plan.

An application based WordPress firewall and security scanner. Pro features add real time security signature updates.

A WordPress security plugin built to integrate with the Sucuri cloud base Web Application Firewall.

One of a number of plugins offering the ability to create sliders/carousels. This one has a decent free version.

LayerSlider separates itself from other sliders by also adding the ability to create popups. In case that's something you also need.