ldebrouwer

An up-to-date WordPress installation is as safe as it can be, plugins however can often pose a security risk because they’re not maintained by hundreds of contributors. A plugin is as secure as the security knowledge of the developer allows it to be. In some cases this creates loopholes for exploits. WP Plugin Security Check checks plugins for bad practices and possible security holes limiting the risk of a compromised WordPress installation to a ‘hate to say I told you so’.

WP Plugin Security Check

WP Plugin Security Check checks if your WordPress plugins are 'safe'.

Japh

A supplement to the Theme-Check plugin that adds checks for ThemeForest’s WordPress Theme Submission Requirements, and removes checks that aren’t relevant in that context.
The <a href="https://wordpress.org/plugins/theme-check/" rel="ugc">Theme-Check</a> plugin is required for this plugin to work.

ThemeForest-Check

it helps a lot to discover problems in your theme. It's a perfect tool that everyone who is developing a theme for themeforest should have. Great!

very useful

A supplement to the Theme-Check plugin that adds checks for ThemeForest's WordPress Theme Submission Requirements.

WP Plugin Security Check vs ThemeForest-Check