Google XML Sitemap is one the best XML sitemap generator till date. This plugin generates a index of URLs which helps search engines to get an overview of the website. Till now it’s been downloaded 12,359,802 times.
- XML Generator: Auto sitemap generator which supports all types of WordPress pages Works3.4
- Easy to Use: Doesn't require any technical knowledge Works3.4
- Flexible: lots of Parameters to change according to users need Works3.4
- Easy User Interface: Calculate & assign priority on sections without much hassle Works3.4
In plugins homepage there is a detailed
FAQ, which is pretty good. Support forum is very active compared to the times it has been downloaded and needless to say support is still top notch.
Plugin ver- 3.4
WordPress ver- 3.8.1
Tested on 30 March, 2014
System configuration: 1 core processsor, Memory - 512mb, 20gb SSD Disk
Generate XML and HTML sitemaps for your website with ease using the XML Sitemap Generator for Google. This plugin enables you to improve your SEO rankings by creating page, image, news, video, HTML, and RSS sitemaps. It also supports custom post types and taxonomies, allowing you to ensure that all of your content is being indexed by search engines. With a user-friendly interface, you can easily configure the plugin to suit your needs and generate sitemaps in just a few clicks. Keep your website up-to-date and make sure that search engines are aware of all of your content by using the XML Sitemap Generator for Google.
The plugin supports all kinds of WordPress generated pages as well as custom URLs. Additionally it notifies all major search engines every time you create a post about the new content.
Supported for more than a decade and rated among the best, it will do exactly what it’s supposed to do – providing a complete XML sitemap for search engines!
If you like the plugin, feel free to rate it! 
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License
Good news, this plugin is free for everyone! Since it’s released under the GPL, you can use it free of charge on your personal or commercial site.
Translations
The plugin comes with various translations, please refer to the WordPress Codex for more information about activating the translation. If you want to help to translate the plugin to your language, please have a look at the sitemap.pot file which contains all definitions and may be used with a gettext editor like Poedit (Windows).