Mario Peshev

DevriX

Create page templates like the ones in your theme folder but through a “DX Templates” menu in your Admin dashboard. Paste HTML, JS and PHP code which you could assign to your posts, pages or custom post types via a meta box dropdown. Create page templates and apply them to be evaluated.
Note: eval() function is used. However, it is available only for admin users to submit code and normally admin users could do a lot harm or upload external harmful plugins as well.
A complete demo is available here:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/jtsbXfNi7ts?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

DX Template Manager

Create page templates like the ones in your theme folder but through a "DX Templates" menu in your Admin dashboard - HTML, JS, PHP supported …

Jan Štětina

This plugin allows to edit and store multiple PHP scripts within WordPress administration (Tools -> Admin PHP Eval) and execute them repeatedly with <code>eval()</code>. After evaluation the return value and echoed data is displayed.

Admin PHP Eval

Storing and evaluating PHP scripts within WordPress administration.

DX Template Manager vs Admin PHP Eval