Empathy - Apps/Empathy - GNOME Wiki!
PandaDoc - Boost your revenue with PandaDoc. A document automation tool that delivers higher close rates and shorter sales cycles. We've helped over 30,000+ companies.
Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Gajim - Full featured and easy to use Jabber client
Apttus - Apttus is a SaaS application provider, renders enterprise class applications for end to end management of business functions.