Zendesk
(User)
Zendesk is a very popular customer support service (helpdesk).
HTTP
(Web Address)
The HTTP Connector lets you execute POST, PUT and GET requests on a web address that you specify.
Use FoxWeave to easily POST to web address when a new User is added in Zendesk.
Cloudant DB

FreshBooks

Google Forms

Google Mail

HTTP

MailChimp

MongoHQ DB

MySQL DB

Oracle DB

OnePageCRM

PostgresSQL DB

Salesforce.com

Sendgrid

MS SQL Server DB

Webhooks

Wufoo

Twilio

Twitter

Zendesk