Thorsten Ott

Simple widget to extend P2s (and other themes) functionality and display recent @replies for a logged in user in the sidebar. 
It can be also configured to show direct replies to comments or posts without the @username indication.

Mention-Me Widget

11-year old plugin and it still works just fine! Sweet!

It works!

Simple widget to extend P2s (and other themes) functionality and display recent @replies for a logged in user in the sidebar.

Timi Wahalahti

This plugin allows you to set deadline for posts and list posts with upcoming deadlines via shortcode.
Plugin is intended to be used with <a href="https://p2theme.com/" rel="nofollow ugc">P2 theme</a> or <a href="https://geto2.com/" rel="nofollow ugc">o2 plugin</a>, but can also work without it – only P2/o2 spesific functionality is datepicker field added to frontend post submit area. Datepicker for setting deadline is also available in classic editor and Gutenberg.
Plugin also automatically adds deadline to the end of <code>the_content</code> output if deadline is set. List of posts with upcoming deadlines are cached to transients to reduce amount of databse queries in large scale sites.

Post Deadlines

As old as this plugin it is, it still works just as expected on latest version of WordPress and P2 :)

Works like a charm

Simple plugin to add deadlines for posts and list posts with upcoming deadlines. Can be used as standalone or with P2 or o2.

Mention-Me Widget vs Post Deadlines