We keep ourselves out of email as often as possible, thanks to Asana. It keeps in the know, helps us manage sprints and hackathons, and helps us be transparent and productive.
We use MailChimp for collecting signups on landing pages, our main app, for drip campaigns, and to send updates to users.
Wordpress is used for our blog and some of our content & landing pages, runs on a subdomain. We also use a custom Python proxy to bring in blog content to the primary domain (/blog).
We track everything that people do when we run campaigns. We also track events & interactions using Angularitics.