With Archive Control WordPress Plugin, finally I found the solution to keep HTML entity in the database for category archive pages and easy add content after posts list.
Coca Cola history: the amazing and at times worrying story of Coca-Cola and its ingredients in the social context.
GeneratePress horizontal menu for mobile in simple steps without plugin and heavy script loading.
WordPress Night Mode Plugin with Night Eye: a simple way to improve User ExPerience, or User Interface, light and fast, very cool graphics.
WordPress Related Posts without plugin could improve the UX if they are the best suggestion posts you can do.