Here is some for you that help some: - Open site explorar - Broken link checker - Link patrol and so on.
he talking about plugin not for online site tools. for op yoast free version is best plugin till to date.
I like yoast. Here are some other good ones https://www.tytonmedia.com/blog/19-must-have-wordpress-plugins-for-2017/
There are many of them and essentially they all do the same thing. That being said, using them wont enhance your rankings if you dont understand what keywords you need for your business and how to optimize you site for those words.
I am using SEO framework plugin for my WordPress blog. It is very light and have all features like yoast. It is far better than yoast. You can check them out.
I recommend you should to use Yoast SEO Plugins because of its very strong and utility for wordpress site.