We just released another great add-on for concrete5! Related Content Panel is a slide out panel that displays related pages.
About the Related Content Panel
Related Content Panel is a set of custom templates (light and dark style) for the Related Pages block that creates a content panel that slides out at a predefined scroll position. It reveals a teaser panel with links to related pages and it can be expanded to full page size to show more. A custom slider allows you to scroll through many items in the panel.