Bad Customers extension you can mark problematic customer’s order, and all of the following orders from the same person will be highlighted automatically.
Google Search Preview OpenCart extension shows you how your product will look like in Google Search results. This information is shown in real time the moment you fill Meta Tag Title and Meta Tag Description in the product form.
Better SEO OpenCart extension gives your store: extra meta tags for search engines (Open Graph metadata – titles, description, images), Google search results preview (with character count for Meta Title and Meta Description), SEO status indicators (reminds administrators about empty SEO data), autogenerates SEO urls (in one click).
Mega Sales Lite extension allows you to set special prices for entire product categories, manufacturers, products with specific filters, and for their combinations (category and manufacturer and filter combinations).
Much improved OpenCart store sitemap for Google, Bing and other search engines: works much faster than the default, dynamically generated OpenCart sitemap, excludes disabled products, works with custom image titles, can be executed manually (link in /admin), or set up as cronjob.