Real Name

"The RealName module allows the administrator to choose fields from the user profile that will be used to add a "real name" element (method) to a user object. Hook_user is used to automatically add this to any user object that is loaded. It will also optionally set all nodes and comments to show this name."

Colorbox

From the module page, "Colorbox is a light-weight customizable lightbox plugin for jQuery."

There are other modules, like Lightbox2, but lately, most people are going with Colorbox, it seems.