Slider Revolution or LayerSlider are bundled in X and you can use them for your banners.
X was built with SEO and marketing in mind so you can build landing / sales pages the are search engine optimized. X also has a Snippet extension so you can add schema markup to your site which is good for search engines.
ConvertPlus is an email marketing plugin that is also bundled in X.
Please take a look at the extensions list in our Knowledge Base to see what else you can use.
X does not have a chat plugin.