devu

This plugin / widget substitutes the default “Links” widget. If you are a SEO specialist, you already know how much important is the rel=”nofollow” attribute in outgoing links. If you are not: links passes part of the PageRank the page has gained to their destinations. Do not let the blogroll section wasting it by donating your pagerank to external sites.
Once installed, under “Settings” -> “SEO Blogroll” you can create how many link boxes you like, each with its own title. Every link box can contain how many links you like. For each link, you can decide if it should have the nofollow attribute or not.
Once your links are ready disable the traditional “Links” widget in “Appearace” -> “Widgets” and activate the new SEO Blogroll.
If your theme supports widgets, you don’t need to change a single line of code, just install the plugin and start using it!
Please report any bug (or enhancements requests) on the plugin main page: <a href="http://www.francesco-castaldo.com/plugins-and-widgets/seo-blogroll/" title="Seo Blogroll" rel="nofollow ugc">Seo Blogroll</a>.
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More information: http://www.francesco-castaldo.com/plugins-and-widgets/seo-blogroll/

SEO Blogroll

Lets you decide which blogroll links have the nofollow attribute. Don't waste link juice!

Oleg Ignatiuk

XML sitemaps are designed to help search engines to crawl and index websites better. <a href="https://pro-sitemaps.com" rel="nofollow ugc">PRO Sitemaps</a> is an online service that creates such sitemaps, auto-updates and hosts them (among other features).
This plugin requires access to the 3rd party service: <a href="https://pro-sitemaps.com/" rel="nofollow ugc">PRO Sitemaps</a>. Please read PRO Sitemaps 
<a href="https://pro-sitemaps.com/terms-of-use/" rel="nofollow ugc">Terms of Use</a> and <a href="https://pro-sitemaps.com/privacy-policy/" rel="nofollow ugc">Privacy Policy</a> before installing the plugin. It uses PRO Sitemaps API, turning an XML Sitemap created by PRO Sitemaps into a self-hosted sitemap, serving it directly using your website domain. The API call to PRO Sitemaps will be made each time sitemap is requested on your website.
Plugin also updates your robots.txt file to notify search engines about your sitemap, and optionally initiates sitemap update each time a new post is created on your website.

PRO Sitemaps Connect

This plugin is turning an XML Sitemap created by PRO Sitemaps service into a self-hosted sitemap by serving it directly using your website domain

SEO Blogroll vs PRO Sitemaps Connect