Google Lighthouse
Description: Google Lighthouse is an open-source automated tool for improving web page quality. It audits for performance, accessibility, progressive web apps, SEO and more.
Type: software
Pricing: Open Source
SpyFU
Description: SpyFU is a competitive intelligence tool that provides detailed keyword research and analysis to optimize SEO performance. It offers keyword suggestions, rankings data, paid search analysis, and site audit features.
Type: software