Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Fast Link Checker - An advanced tool to find broken links on web sites.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.