Simple Admin Activity Log
Records logins, plugin and theme changes, updates, role changes and deleted content, and lists the last 300 events under Tools > Activity Log.
Snippet Library
Security snippets for WordPress
Snippets that harden WordPress: turn off XML-RPC, hide the version number, stop user enumeration, add security headers and block risky uploads. Small, reviewable changes for site owners who want fewer attack points without a heavy security plugin.