As a developer, if I see something repetitive and manual, I look for a way to automate it or at least to work less as possible.
For example I got tired of going to google and write site: domain.com, I made a shortcut so I only have to visit the website and click on the bookmark and automatically it make the query on google without have to write anything.
To use these shortcuts you only have to drag them into your bookmarks bar, these shortcuts are made with javascript so they work on any browser and you don’t have to install any extension.
SEO On Page
SEO – Keyword Research
Related Websites
SEO Tools
check domain sistrix
spain database by default
check domain keyword sistrix country
you can choose the keyword and the country database (es, uk, us, de, it, fr, nl, pl, se, at, ch, br, tr), shortcut made by Natzir Turrado
Validators
WPO
Search for content
search flickr creative commons
Others
builtwith (check the technologies that are using the website)