SEO Tool Suites » Moz – link research, analytics, rank tracker, crawl test, more. » more
SEO Rank Checkers » Authority Labs – 30 day free trial, no credit card required » more
Keyword Research » SpyFu – spy on the keywords competitors are using for SEO and PPC. » more
Link Building » Ahrefs – crawls 5 million web pages, indexes 12 trillion known links. » more
Local SEO » BrightLocal – citation tracker, local rank racker, review site tracking, more. » more
Technical SEO » Screaming Frog – Desktop website spidering software. » more
Courses » Udemy – search engine optimization certification courses (various). » more
Forums » /r/SEO/ – largest SEO subreddit at Reddit. » more
YouTube » Moz – in-depth whiteboard videos, presentations from MozCon… » more
Conferences » SMX (Search Marketing Expo) – many events around the world. » more

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