SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Mobbin - Latest mobile design patterns & elements library
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
pttrns - iPhone and iPad user interface patterns
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
Page Flows - User flow design inspiration for mobile & desktop