ryotsun

<ul>
<li>Save all posts on slack to the database in WordPress</li>
<li>It will be made blog posts by each channel per day</li>
<li>Create categories by teams and channels automatically</li>
</ul>


WP Slack Logbot

Stores all messages of particular channels on slack. And able to see them.

rheinardkorf

<p>Invitations for Slack lets you use convenient shortcodes to show “Join us on Slack.” buttons or Slack badges. Just add<br />
your Slack token and use the shortcodes wherever you want your visitors to be able to invite themselves from.</p>
<h3>Features:</h3>
<ul>
<li>Easy to use:
<ul>
<li>Visit <a href="https://api.slack.com/web" rel="nofollow ugc">https://api.slack.com/web</a> to generate your Slack token.</li>
<li>Add the token to the plugin settings.</li>
<li>Use the [invitations_for_slack] or [invitations_for_slack_badge] shortcodes.</li>
</ul>
</li>
<li>Invitations are performed using the WP REST API which in turn communicates with the Slack API. No page reloads.</li>
</ul>
<h3>Requirements:</h3>
<ul>
<li>A Slack team and the team’s access token.</li>
<li>A self-hosted WordPress website (Not a WordPress.com website.)</li>
</ul>


Invitations for Slack

Plugin doesn't work unfortunately.

Have raised several issues in the support forum and still no response after months.

Doesn't work

Build a Slack community by allowing your visitors (or registered users) to invite themselves to your Slack team.

WP Slack Logbot vs Invitations for Slack