Slack API: https://api.slack.com/
Slack API dialog creation: https://api.slack.com/dialogs
Secure tunnels to localhost: https://ngrok.com/
Imgur client registration: https://api.imgur.com/oauth2/addclient
Quick start with Python on Heroku: https://devcenter.heroku.com/articles/getting-started-with-python#introduction
Automation with IFTT: https://ifttt.com/