Christoph C. Cemper presented 20 essential free SEO tools at BrightonSEO, emphasizing tools like Google Search Console, Google Analytics, and various web-based crawlers and plugins. He provided insights on combining data from multiple sources, keyword research, and desktop crawlers, along with free extensions for Chrome and Firefox. Additionally, he introduced the LRT Link Checker and announced an upcoming link conference, LRTCon, aimed at fostering collaboration between developers and marketers.