sylletka

This plugin lets site administrator to add textual widgets to the dashboard; the displaying of these widgets may be limited to certain roles too.

WordPress dashboard widgets

This plugin allows site administrator to easily add simple text widgets to the dashboard

gqevu6bsiz

This plugin to show announce for per user roles.
And, if you want to change plugin capability, please refer to this code.
For example add filter:
<pre><code>function afd_custom_change_capability( $capability ) {
 // plugin minimum capability
 $capability = 'edit_posts';
 return $capability;
}
add_filter( 'afd_capability_manager' , 'afd_custom_change_capability' );
</code></pre>
And, if you want to add filter, please refer to this code.
For example add filter:
<pre><code>function afd_custom_filter( $announces ) {
 // filter
 return $announces;
}

add_filter( 'afd_before_announce' , 'afd_custom_filter' );
</code></pre>
<h3>日本語でのご説明(Japanese description)</h3>
このプラグインは、ダッシュボードにお知らせを表示するプラグインです。 
ユーザーの権限グループ別に、編集者のみへの表示、 
投稿者と寄稿者と購読者のみに表示する設定もできます。

WordPress dashboard widgets vs Announce from the Dashboard