Websitecode

This plugin adds a “Delete” link below comments made by logged-in users, allowing them to delete their own comments via AJAX, without page reload. Editing comments is not allowed.

User Comment Delete

Allows logged-in users to delete their own comments via a Delete link under each comment.

ramon fincken

Auto deletes expires (prunes) posts or pages after a certain amount of time. On a per category basis (single category, or all at once). 
Handy if you want to have posts with a limited timeframe such as offers, coupons etc.. 
Posts will auto delete on a per category basis: single category OR all categories at once. 
All (custom)post types are supported. (CPT support) 
Will also trash post attachments. 
Sends notification to site admin (can be turned off). 
No cronjob needed 🙂
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<li>Coding by: <a href="https://www.mijnpress.nl" rel="nofollow ugc">MijnPress.nl</a> <a href="https://mastodon.social/@ramonfincken" rel="nofollow ugc">Mastodon profile</a> <a href="https://profiles.wordpress.org/ramon-fincken/" rel="nofollow ugc">More plugins</a></li>
<li>Idea by <a href="https://www.nostromo.nl" rel="nofollow ugc">Nostromo.nl</a></li>
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Donate <a href="https://donate.ramonfincken.com/" rel="nofollow ugc">https://donate.ramonfincken.com/</a>

Auto Prune Posts

Needs to be updated; too many errors thrown. Hopefully this will be attended to as it's a really useful plugin otherwise.

Throws errors on activation.

Auto deletes expires (prunes) posts after a certain amount of time. On a per category basis (single category, or all at once.

User Comment Delete vs Auto Prune Posts