Pixpie - Optimize your images and speed up your site on WordPress
Curatedseotools.com - Curated directory of the best SEO tools.
Pixabay Images 3.0 for WordPress - Search and insert images directly within WordPress
Content Editor 2.0 by Surfer - Content Editor is the most advanced content optimization tool that allows you to write and grade your work.
Website Image Speed Test - Beautiful & easy free analysis of the images on your page
Rank Math SEO - A FREE powerful and lightweight SEO plugin for WordPress