Tools for SEO:

Ahrefs:

This tool allows you to constantly monitor and verify links pointing to a website. It also provides a large amount of very useful data for analyzing competing sites.

SEMrush:

SEMrush helps track your ranking on search engines, and a lot of data is provided like the ranking of sites that are positioned on the same keyword.

Cocoon:

This is a visualization tool that analyzes the internal architecture of a site that lets you know what a crawler sees when it scans your page, and it also provides interactive views that provide you information on the structure of your site.

Gephi:

This is an open source and free software which helps you to analyze data from a website, it is used to study structures of pages on a site.

SeRanking:

It offers a set of practical features that perform a full site audit such as, real-time keyword positioning tracking and monitoring.