Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
DeltaSalesApp - Field Sales Force Automation & Field Force Tracking Software
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Smart Service - Smart Service's QuickBooks integration makes it the ultimate scheduling and dispatch software for HVAC, plumbing, pest control, and other service industries.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Service Cloud Field Service - Service Cloud Field Service is a cloud-based field service solution designed to initiate customer service activities from anywhere.