This is a helpful roundup of free SEO tools: 6 Indispensable SEO Tools via Kissmetrics.com. Nice job KISSmetrics.
March 2018 Update: The folks over at AuthorityHacker.com have come up with a valuable new tool that looks at SEO “kits” for different levels of budget. For example, in their free tier kit for keyword research, they recommend using Mozbar + Similar Web Chrome extension + the free version of SEM Rush. Check out their full article, We Made Kits of SEO Tools for Every Budget.
I’ve used all of these search engine optimization tools for regular and local search optimization and I can vouch for their usefulness.
I didn’t learn about authoritylabs.com for keyword rank tracking until recently when an SEO friend of mine recommended them. Authoritylabs.com’s free solution is perfect for an average small business where you have one domain to track and a relatively small number of major keywords.
Give these a try if you haven’t already.