This is a simple block for added Next and Previous links to pages, to navigate between other pages on the same level (ones that share the same parent page).   You can type in your own labels to replace the default "Next" & "Previous", or you can use the actual page names as link.  There's also an option to have the links loop, and to have it add « » style arrows.

Note: this block is included in the core as of concrete 5.4.1

Project Page: http://concrete5packages.com/toolbox/next-previous/