Franz

Slackline allows you to share Slack channels with other teams

Connect Slack to Skype, HipChat, and more.

Launch an online community with Mightybell you manage from Slack

Get the top posts from every Slack chat you're in.

Chat with Salesforce, Github, Mailchimp, Zendesk and 100 other apps.

One-click shared channel between 2 Slack teams

Chat with friends and teams on different IM networks (Currently Jabber and IRC)

Metachat makes it easy to deal with multiple Slack teams.

Use 🍑 from Slack!

Easily update other teams about your work, through Slack.