A huge set of systemized tools. Allows you to check your projects well and check the strategy of your successful competitors. As for me, keyword clustering, TOP by keyword in keyword research, and backlink analyzing tools deserve special attention.

It's really easy to use this tool on a daily basis for different needs. There are a lot of different metrics and reports, which you can use to analyze your own service or your competitors'. My favorite module is Rank Tracker, there you can track your positions every day or, according to your custom settings. All you need is a created project to configure easily.

A nice SEO tool. Serpstat is great for SEO and Competitor research, backlinks and even Ads spy. It helped me to spy competitors with a lot of data.Also, the support is helpful and responsive.