isaacwedin

This plugin automatically creates a title for posts that do not have one. If the post contains text, the title is set to the first few characters of the post. For posts without any text content, the title is set to a configurable untitled post string.
<h3>Credits</h3>
This plugin is based on ideas from the Prologue theme and Luke’s Default Post Title plugin.

Titlematic

Automatically generates a title for posts without a title.

Philip Arthur Moore

We Cobble

Right now WordPress currently presents no easy way for web publishers to add subtitles into their posts, pages, and other custom post types. This leaves users and developers in a bit of a quandary, trying to figure out how best to present subtitles in a beautiful and sensible way. Post <a href="https://codex.wordpress.org/Function_Reference/the_excerpt" rel="nofollow ugc">excerpts</a> are a very poor choice for subtitles and the only available option outside of <a href="https://codex.wordpress.org/Custom_Fields" rel="nofollow ugc">custom fields</a>, but custom fields aren’t entirely self-explanatory or user-friendly. This simple, straightforward plugin aims to solve this issue.
Simply download Subtitles, activate it, and begin adding subtitles into your posts and pages today. For more advanced usage of the plugin, please see the <a href="https://wordpress.org/plugins/subtitles/faq/" rel="ugc">Frequently Asked Questions</a>.
If you like Subtitles, <a href="https://www.paypal.me/wecobble" rel="nofollow ugc">thank me with coffee</a>. If you find it buggy, <a href="https://github.com/wecobble/Subtitles/issues" rel="nofollow ugc">tell me on GitHub</a>. And if you have a cool example of how you’re using Subtitles on your website, let me know on <a href="https://twitter.com/philip_arthur" rel="nofollow ugc">Twitter</a>.

Subtitles

Thanks. Hopefully it will get Gutenberg support too when the time comes.

Clean code, no ads or nags, works perfect

Add subtitles into your WordPress posts, pages, custom post types, and themes. No coding required. Simply activate Subtitles and you're ready.

Titlematic vs Subtitles