Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs