Mailchimp is the gold standard for the marketing automation market as one of the most powerful and versatile tools out there. With Mailchimp, you can easily build targeted campaigns, newsletters, landing pages, complex automation workflows, and much more.
Quickbooks is an accounting app for small businesses and one-man bands. A full scope of app integrations and features such as invoicing, billing, accounting and estimates, will help you keep those books balanced and stay organized without losing valuable time.
PieSync offers the only solution in the market to keep your customer data in sync two-ways and in real time, processing new entries as well as historical data. Your contacts are kept in sync automatically, so you don't need to worry about it once the configuration is set up.