Ahrefs: Best for backlink analysis and keyword research.

SEMrush: Comprehensive all-in-one SEO and competitor tool.

Moz Pro: User-friendly with a strong focus on site audits and link metrics.

Google Search Console: Essential for monitoring indexing and site performance (free).

Screaming Frog: Great for technical SEO audits.

Surfer SEO: Excellent for optimizing content based on top-ranking pages.

Yoast SEO: Ideal for on-page SEO on WordPress.

AnswerThePublic: Generates topic ideas based on popular search queries.

If you need an all-rounder, go with SEMrush or Ahrefs.