Google XML Sitemaps
This plugin makes it easy to register the website with search engines of Google and MicroSoft (Bing).

After installation and activation the plugin is accessable from the WordPress dashboard at Settings > XML-sitemap. I found the plugin very easy to use.

Revisr
I find it very useful to have version control on the sources of my website. As far as I know GIT is the de facto standard for version control.

There are several plugins that add some kind of GIT-support. But after looking at them, I wasn’t really happy. From my perspective the plugins seem to mix version control with backups.
I mean for my pages I want version control with all the tagging and branching stuff of GIT. But I don’t want that for my WordPress installation. I’m quite happy with backup images of my Raspberry Pi SD-card for the WordPress installation.
Think about it, when I go back to an older version of my website, I still want the latest WordPress installation and the latest version of plugins and themes.

Furthermore I see version control on the uploads folder. That seems completely useless to me. I don’t have various versions of the same picture and when I have multiple version of say a PDF than each version has a unique name and these versions live happily next to each other at the same time. It is enough that my uploads are safe on a raid storage,

I found Revisr the most complete plugin to use WordPress plugin for GIT. Most people you will use a GIT- repository on a website like Github. They don’t need a SSH key connection to GIT. I have chosen another solution as explained on the next page. Since Revisr has no support for SSH key connections it is not an easy solution. (I might look at Gitium + some database manager plugin to see if this is a better solution.)

Revisr has an issue with database backups. It stores its database backups in a sub-folder of the wp-content/uploads folder. (Very, very strange to mix backups and uploads !!)
Since I moved my wp-content/uploads folder outside the local GIT-branch, the Revisr database backups are also outside the scope of the local GIT-branch.
Via a soft link I fixed this, but it is not an elegant solution; (sudo ln -s /var/www/html/wordpress/wp-content/revisr-backups /mnt/raiddrive/wp-content/uploads/revisr-backups ). 
This however the result of strange decision of the Revisr developers to mix database backups with uploads instead of using a separate backups folder