Keyword Tool tells you the keyword competition and the conversion rate and all the essentials one would highly need to get ranked.
Majestic SEO is the best backlink checker tools. You can spy any links that your competitor have. TF and CF parameter can revealed by this tool.
InstantLinkIndexer make your links indexed very fast, so your rankng will change faster after.
Alexa is competitor research tool. You can reveal any parameter of your competitor level.
Moz, making your inbound marketing easy and the platform which enables you to analyze and monitor SEO, link building, social media marketing and other similar online marketing areas.
Serverifiedtargets provide million good link for imported into GSA SER.
Doomcop Used for searching very good parameter domain. Very good for determine like PBN or sell able domain with high price.
WordAi Spinner great tools to make unique and readable content. It support English, French, Spanish, and Italian Content.