Badges plugin encourages members to perform various activity, frequently interact with each other and compete with friends in your social network. It is a simple and fun way to increase interaction and reward member activities. You can create different badges and define conditions to get them, for instance 30 blog posts to get Super Blogger badge and 10 music tracks for Music Lover badge. Badge can contain multiple conditions.
Sitemap is a tool that inform search engines about the structure of your site. By placing a sitemap on your website, you enable Search Engine crawlers (like Google) to find out what pages are present and which have recently changed, and to crawl your site accordingly. You don't have to manually submit sitemap as it automatically (if settings is enabled in the admincp) Notify Popular Search Engines (Google, Bing) when sitemap changes.
E-Library/Books Plugin provide an opportunity to create a real library on your website. You and your members can "Create a New Book", organize them into various categories which will auto Share to News Feed Page. Also, Members can Read Books on your website or Save Offline (Download)