Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Redmine - Flexible project management web application
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs