Screaming Frog is an UK search marketing agency based in Henley-on-Thames Oxfordshire.
I've noticed them due to the wildly popular freemium SEO software "SEO Spider" of the same name they offer. I tested it only a few times but many people in the SEO industry rely on it and pay regularly to be able to use its full set of features.
I followed founder Dan Sharp and his company ever since and was pleased with what I saw, both the level of expertise and the social skills. Thus I decided to add Screaming Frog to my directory.