SheerSEO - SheerSEO helps you to track Google Search Engine Rankings for critical keywords. PageRank, Back Links and more.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GrepWords - Grepwords is an API-first Google Keyword Suggestion Tool.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
iSpionage - AdWords competitor keywords with the click of a button and monitor competitor PPC landing pages.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.