Linear - Streamlined issue tracking for software teams
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.
BugHerd - BugHerd: The Website Feedback Tool for Agencies
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Distiller - Distiller's hosted continuous integration platform takes the pain out of mobile development through automated build, test, and deployment of your iOS apps.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.