seo tools for agencies

There is an endless list of SEO tools that is offered in the market and everyone is claiming that his tool is so crucial, the question is what is actually crucial and what is a luxury to have? I don't know the full power of scrapebox and I couldn't find a way to learn about it's potential...

I have been looking for combo packs which consist all sorts of seo tools for research and analysis. My usage isn't heavy so I think such a solution would be much better rather then spending 100s if not thousands of $$ buying individual premium accounts. As of now I have come across...