As a startup freak myself, I am always looking for new ways to make the company better and communications between the teams easier. I like Slack as a communications tool as well as Asana. HipChat is pretty slick for instant messaging and integration with inbound customer service live chatting forums. As far as CRM I happen to like Close.io which offers calling directly from the CRM but also tracking of all emails in & out. Easy User Interface and they are slowly getting the tools needed to compete with the big boys.