Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.