I use Slack for many things and it's great to see how many integrations are available out of the box. But building integrations yourself is extremely easy using Incoming Web Hooks.http://sandrinodimattia.net/posting-successful-ssh-logins-to-slack/
Wouldn't it be nice if you could see a message in Slack each time a user connects to one of your machines over SSH? Yes it would!
(I found this via cron.weekly. If you haven't subscribed yet, you're missing out)