Okular - Okular is a universal document viewer based developed by KDE.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs