rufein

WordPress Seo Integration is a plugin to integrate the WordPress SEO plugin by Yoast plugin and mqTranslate (a fork of qtranslate) 
to manage the meta fields and sitemaps in a website with different languages.
The plugin is an Alpha version and only has the next features:
<ul>
<li>Administration panel to manage the meta fields filtered by language. The plugin make use of the WordPress SEO functions to measure the 
quality of SEO of every post in the website.></li>
<li>Build a sitemap with languages. the plugin build a sitemap from the type of post and from the language. For example, it builds an 
xml sitemap called page-es and other called page-en.</li>
</ul>
<h3>Arbitrary section</h3>

Integration of Yoast wordpress SEO module with mqtranslate module

Integration between the popular Wordpress SEO module by Yoast and mqtranslate plugin (a fork of qtranslate that is updated).

Soft79

Migrates WPML translations to qTranslate.
Compatible with: 
<a href="https://wordpress.org/plugins/qtranslate-x/" rel="ugc">qTranslate X</a>, 
<a href="https://wordpress.org/plugins/qtranslate-slug/" rel="ugc">qTranslate Slug</a>, 
<a href="https://wordpress.org/plugins/woocommerce-qtranslate-x" rel="ugc">WooCommerce & qTranslate-X</a> (best used in combination with qTranslate X) and 
<a href="https://wordpress.org/plugins/qtranslate-support-for-woocommerce/" rel="ugc">qTranslate support for WooCommerce</a>
Might be compatible with other qTranslate forks and helper-plugins as well, but not tested.
Goodbye WPML, Hello qTranslate!
Note: This plugin will save you a lot of work, but more configuration and tweaking might be necessary.

W2Q: WPML to qTranslate

Migrates WPML translations to qTranslate.

Integration of Yoast wordpress SEO module with mqtranslate module vs W2Q: WPML to qTranslate