Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
Kindful - Nonprofit donor database + fundraising tools all in one
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.