Sergey Biryukov

Converts gettext binary message catalogs to an array of strings. Allows to save some amount of RAM on a shared hosting server. 
Works with plugin and theme textdomains as well as with the default.
Thanks to AlexPTS for the idea.

Pure PHP Localization

Лучший и, скорее всего, единственный рабочий плагин. Спасибо, Сергей

Пожалуй, лучший плагин для кеширования переводов

Converts gettext binary message catalogs to an array of strings.

Memorista

<h4>Memorista is shutting down</h4>
We would like to sincerely thank all users of the WordPress plugin Memorista. Your trust, feedback, and long-standing support mean a great deal to us, and we are deeply grateful that you chose Memorista to collect and share memories on your websites.
This message is to inform you that Memorista is being sunsetted due to a lack of time to continue maintaining the project. Memorista has always been provided free of charge, and we never introduced a paid subscription over all these years. Unfortunately, we are no longer able to sustain the required maintenance under these conditions.
The plugin will remain active until the end of February 2026. From March 2026 onwards, all Memorista data will be permanently deleted.
Please ensure that you migrate to another guestbook plugin before this date and export and securely store your guestbook data in time to avoid any data loss.
If you are interested in taking over, pursuing, or maintaining the Memorista project, please feel free to <a href="mailto:info@floriangyger.ch" rel="nofollow ugc">get in contact</a> with us.
Please note that we accept no liability for any data loss after the shutdown date.
Once again, thank you very much for being part of the Memorista journey. Your support has truly meant everything to us.
<h4>Memorista for WordPress</h4>
Let your guests share their memories by creating your own guestbook with Memorista.
This plugin helps you integrate your Memorista guestbook onto your site. If you don’t have a Memorista account yet, you can create one for free at <a href="https://memorista.io" rel="nofollow ugc">memorista.io</a>.
<h4>Features</h4>
<ul>
<li>Create your own Guestbook for any purpose in just 5 minutes.</li>
<li>Admin UI to manage all entries including the ability to remove undesirable submissions.</li>
<li>Memorista speaks your language. Simply define the language of your Guestbook in the settings and the Memorista Widget automatically adjusts without you having to update anything.</li>
<li>Customize the title, description and language and make it blend in with your WordPress site. Your users will be able to post entries without ever leaving your website.</li>
</ul>

Offer guestbook functionality on any WordPress site in just a few steps.

Pure PHP Localization vs Memorista