Many organizations with a Slack workspace have a link to Herokuapp instance that allows users to submit their email address and automatically send them a Slack invite.
Here's a community with a really groovy one-click implementation:
http://modernagile.org (see "Join us on Slack" at the footer)
Many organizations with a Slack workspace have a link to Herokuapp instance that allows users to submit their email address and automatically send them a Slack invite.
Here's a community with a really groovy one-click implementation: http://modernagile.org (see "Join us on Slack" at the footer)
(though many are succeeding with just hyperlink to the bare-bones Heroku-deployed app): https://productstack-slack.herokuapp.com
Here's one possible implementation (or perhaps it's the canonical implementation, I stopped when I found one):
https://elements.heroku.com/buttons/marchettibr/invite_slack