A cheat sheet for getting started with Slack's APIs
Hack a Staples Easy Button with an Adafruit Feather HUZZAH to send Slack alerts
What can you do with a C64, a Raspberry Pi, 6502 assembly, node.js & the Slack API?
This guided tutorial takes around 45 minutes to complete. Botkit is invovled.
The obvious choice at the time was, and still is, Slack. That has completely been validated by Slack's growth over the past two years.