We use a lot of services at DNSimple. Here are some of them: Chargify (http://chargify.com/ http://chargify.com/) - recurring billing Stripe (http://stripe.co

We use a lot of services at DNSimple. Here are some of them: Chargify (http://chargify.com/ http://chargify.com/) - recurring billing Stripe (http://stripe.com/ http://stripe.com/) - payment processing Librato (https://metrics.librato.com/ https://metrics.librato.com/) - metrics Mailgun (http://mailgun.com/ http://mailgun.com/) - email service Boundary (http://boundary.com/ http://boundary.com/) - network analysis Papertrail (http://papertrailapp.com/ http://papertrailapp.com/) - consolidated logging PagerDuty (http://pagerduty.com/ http://pagerduty.com/) - alerting TravisCI Pro (http://travisci.com/ http://travisci.com/) - continuous integration CodeClimate (http://codeclimate.com http://codeclimate.com) - static code analysis BugSnag (https://bugsnag.com https://bugsnag.com) - exception tracking Also, other services that have already been mentioned (like Github, Intercom, Trello, Dropbox, Sendgrid, NewRelic, etc)