Where Can I Find The Best Seo Tools Online??

I know what I have to do, but there are soo many tools online. Some are free, some are paid software. I don’t know where to begin. Could you please provide me with the BEST free online tools for:
1. Keyword Density Check
2. Keyword Suggestion tool
3. Keyword Ranking
4. Link analysis
5. Link exchange
Also, are there any Word templates for SEO or datebook entry sites where I can chart my progress? Thanks so much.
(Please respond only if you know what you’re talking about and are involved in SEO. If you’re just gonna wikipedia or google a site/article and send a link I don’t want to get bad information from people who just want points or promote your comapny..please I’m trying to do this for my business site)

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