1. Multilingual PressThe multisite-based free open source plugin for your multilingual WordPress websites.
2. WonologMonolog-based logging package for WordPress.
3. Wp Rest StarterStarter package for working with the WordPress REST API in an object-oriented fashion.
6. assetsInpsyde Assets is a Composer package (not a plugin) that allows to deal with scripts and styles in a WordPress site.
8. menu-cacheEasily cache rendered menus using the Transients API.
12. WP-StashBridge between WordPress and StashPHP, providing a PSR6-compliant caching system for WordPress