Matthew Creager goes through about how you can deploy your Slack bots to Heroku.
Kevin Deisz from Localytics goes through how you can build serverless Slackbots with AWS Lambda. Lambda is one of the most interesting things to come out of AWS for many years and also powers my product Nestor
Slack has great support for rich responses that you can send and with yesterday's announcement you can now preview how your rich messages look like. Great feature!
Not to get left out Google also has great support for building Slack applications and if Google Cloud is your thing, then this piece contains some great tips and tricks!