n3k4

It is a common SEO technique to remove ‘stop words’ from the slug URL that are considered low priority in the search algorithm. Also, it helps trim the maximum URL length by creating a summary of the post title rather than the full text.
This plugin will remove the stop words from the URL from a defined list you can edit in the options.
A list of predefined stop words are included with the plugin and also available <a href="http://kaneandre.ws/wp-content/uploads/stop-words.txt" rel="nofollow ugc">here</a>.

Remove Stop Words

Remove stop words from the slug URL in your permalinks for search engine optimization.

Rick Radko

This plugin removes the ‘/blog’ slug from the main site permalinks of a sub-folder multisite install. The intended purpose for this plugin 
is for multilingual installations where the main site is the default language (although I’m sure there are other applications). These sites 
are of often for businesses where having the ‘/blog’ in the permalink (URL) does not make sense.
‘/blog’ is automatically removed from the main site permalinks upon plugin activation.
‘/blog’ is automatically restored in permalinks upon plugin deactivation.

R3DF Multisite Blog Slug Remover

Removes the '/blog' slug from the main site permalinks in a multisite.

Remove Stop Words vs R3DF Multisite Blog Slug Remover