Skype for Slack - Move your slack discussions to a group skype call
PullReminders - Review and release pull requests faster with Slack reminders and metrics.
Calls on Slack - Make voice calls in Slack
emacs-slack - slack client for emacs. Contribute to yuya373/emacs-slack development by creating an account on GitHub.
Pingly - Your communication hub — Email, text & voice in one app
Wey - Fast open source Slack desktop app