I really like the simple design! But I think the light gray text contrasts poorly with the background. It's hard to read; I think it will put off some users. I'd up the text to a darker shade of gray.
As you create more tools, you'll eventually run into the problem of a list that's too long on the right-hand side. Eventually, the list will go below the fold, which is fine for sub-pages, but not for the homepage, where you want to show right off the list of tools. I'd replicate the tool links at the top of your homepage.
I'm into the keyword generation tool, but I'd put headers in the result column. I assume, for example, that the numbers to the left of the keywords are the number of times that the keyword has been searched over a given time. I think you should indicate the source of the stat.
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