We switched to Nightwatch from Stat after some issues and realizing they support wide range of functionalities with have a more friendly interface. Happy so far!
Xenon Mail - Xenon Mail is an automated retargeting system, providing companies with the ability to remind email recipients of campaigns.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
AdRoll - AdRoll is a leader in retargeting display advertising. Draw the right people with the right strategies.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
ExactDrive - Self-serve online advertising platform.
SEO Tools Centre - SEO Tools Centre provides SEO checker services for websites.