WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
TreeSize - TreeSize tells you where precious disk space has gone to.
Wordfence - Comprehensive security plugin for WordPress.