Modules for Backdrop CMS

Provides an Administrative UI and Developers API for managing the mail backend/plugin.

A light-weight, customizable lightbox plugin for jQuery 1.4.3+. Iframed or
inline images or content can be displayed in a popup or modal "lightbox" above
the current page.

The Colorbox module:

Webform Remote Post is a module that works along the Webform module. It eases the integration between Webforms and other web applications (including systems like Salesforce and Eloqua).

DISQUS is a third-party comments platform that helps you build an active community from your website's audience. It has awesome features, powerful tools, and it's easy to install.

Display recent comments, popular threads, and other widgets in blocks

This module provides a single block that can show social media icons that link
to your brand's content located elsewhere on the web such as Twitter, Facebook
and the like.

GlobalRedirect is a simple module which redirects visitors from one page to another.