It is easy accordion, shows posts anywhere via shortcodes, inherits the theme style and theme colors and does not divert the attention away from the information on the site.

Alphabetic pagination is a great plugin to filter your posts/pages and WooCommerce products with alphabets. It is simple to use and easy to understand for customization.

RSS Feed Widget with customizable slider. Feed title, description, image, censorship and a few other features which you can use.

A great WordPress plugin which helps you to choose a unique style for your favorite plugins and themes.