cobianzo

This is a very simple plugin that allows you to associate a tooltip to any link in the block editor. 
Open the link options, click on the pencil icon to edit it, then make sure that the Advanced panel 
is open, and find the new input box for the tooltip. 
You will see the tooltip when you hover with the mouse the link in the frontend.
Main features: 
– new ‘tooltip’ input box in the CMS editor ‘edit link’, under ‘Advanced’ tab. 
– showing this new field as a simple CSS-only tooltip in the frontend 
– CSS rules use some variables to easily modify the aspect of the tooltip.

GB CSS Tooltip

Simple functionality that includes an extra option when editing a link within the block editor: nice CSS tooltips.

BibleAsk

BibleAsk – Verse Tooltip transforms plain Bible references in your content (e.g. “Genesis 1:1”, “Colossians 3:3”, “Psalm 23”) into clickable links that point to the corresponding passage on BibleAsk.org. References in parentheses like (Colossians 3:3) are also supported.
Features:
<ul>
<li>Auto-links common formats: book + chapter, book + chapter:verse, book + chapter:verse-verse</li>
<li>Does not linkify references that already appear inside an HTML link or (optionally) inside a heading</li>
<li>Supports references in parentheses, e.g. (John 3:16)</li>
<li>Optional hover tooltip with reference and link (and optional verse text fetched from BibleAsk.org)</li>
<li>Settings: open in new tab or same tab; apply to posts and/or pages; enable tooltip; show verse text in tooltip; tooltip can show BibleAsk logo and branding (logo files are bundled with this plugin)</li>
<li>All JavaScript and CSS are included locally; no third-party CDNs for plugin assets</li>
<li>Uses WordPress transients and in-memory cache to speed up tooltip verse loading</li>
</ul>
Link behavior:
<ul>
<li>Control whether links open in a new tab</li>
<li>Choose to apply linking to posts, pages, or both</li>
<li>Optionally skip linking inside headings (h1–h6)</li>
<li>Toggle the hover tooltip on or off</li>
<li>Optionally show the full verse text in the tooltip (fetched from BibleAsk.org and cached)</li>
<li>Optionally show BibleAsk logo and “BibleAsk” in the tooltip link text (credits default to hidden)</li>
</ul>
<h3>External services</h3>
This plugin relies on BibleAsk.org (operated by BibleAsk), an external website that hosts Bible reading pages and related content.
What it is used for
<ul>
<li>Links: Detected Bible references in your content become links to the matching passage pages on BibleAsk.org (HTTPS). When a visitor follows a link, their browser requests that page from BibleAsk.org like any normal website visit.</li>
<li>Optional verse text in the tooltip: If you enable “Show verse text in tooltip,” your WordPress site requests the same passage URL from BibleAsk.org over HTTPS (server-side, using WordPress <code>wp_remote_get</code>). The response HTML is parsed to extract verse text for display in the tooltip. That request is only made when a visitor triggers the tooltip flow and the verse is not already cached. The URL contains only the passage location (book/chapter/verse path). This plugin does not send your users’ names, email addresses, WordPress account details, or other personal data to BibleAsk.org as part of that request.</li>
<li>Branding: The settings screen and optional tooltip can display BibleAsk logos supplied as image files inside this plugin (they are not loaded from BibleAsk.org’s servers by default).</li>
</ul>
Legal links for the service
<ul>
<li>Terms of Use: https://bibleask.org/terms-of-use/</li>
<li>Privacy Policy: https://bibleask.org/privacy/</li>
</ul>

BibleAsk – Verse Tooltip

Turns Bible references in posts and pages into links to BibleAsk.org, with optional hover tooltips showing the verse.

GB CSS Tooltip vs BibleAsk – Verse Tooltip