Update: 21-09-16

Zapier

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The easiest way to integrate Slack with hundreds of complementary apps.
Zapier supports Gmail, Basecamp, Evernote, Google Sheets, Typeform, Wufoo, Salesforce, Pipedrive, HubSpot, Facebook Pages and more…
Trigger new Slack messages for events in other apps, such as when you receive a Gravity Forms form entry or add a contact to Zoho CRM. You can also send message contents to other apps by triggering on new "Starred" messages—great for creating tasks in Trello, Asana or Todoist.
Zapier is proudly used by thousands of Slack customers for hundreds of integrations and automations.