MOZ.com = Software created by SEO experts
MOZ.com (formerly SEOMoz.com) provides SEO software, tools and training. What I like most about MOZ is that I trust their results. Additionally, I always look to their thought leadership and training on any topic related to SEO, SEM, PPC, Keyword Research, Local SEO, etc.
MOZ is feature-rich with multiple modules and the ability to track performance of multiple websites. Products include: -Moz Pro - Search Marketing: -Moz Local - Local Search Marketing -Moz Content - Content Marketing -Followerwonk - Twitter Analytics -Mozscape API
MOZ, although feature rich, is somewhat expensive for the base package. If you want the other modules like Keyword Research, Backlink Reports, Local SEO, you have to pay extra for each.
I selected MOZ for the quality and breadth of its features.
Keyword tracking, backlink discovery
MOZ allows us to identify missing, broken and/or irrelevant backlinks across the major search engines.
MOZ is a sophisticated SEO suite. If your budget doesn't justify their pricing plans, there are numerous other tools, websites that can provide very good alternatives.