Sitebeam - Spelling mistakes, SEO, load speed, social media, code, W3C, accessibility & more in one tool.
Ryte - Ryte is a web-based software invented for technical optimization for search engines and improvement of websites.
Omniconvert - Omniconvert is an award winning CRO software that can be used for A/B testing, online surveys, traffic segmentation and web personalization
RankScience - Advanced Content Optimization Software for SEO
Siteimprove - Consider the Siteimprove Intelligence Platform the newest member of your team.
SISTRIX - SISTRIX toolbox is an SEO tool for professionals helping reputable companies to constantly improve their websites.