Yalogica

XCmdr allows you to organize your Media Library into folders or categories. Keeping your Media Library organized is essential, and this plugin will assist you in categorizing your images. To create a category, navigate to Media > Categories and set up a new category. Then, head to Media > Library to move your images into the designated category.
When you add or edit an image in the Media Library, you can choose the category or categories for that image.

XCmdr

Streamline your media library with folders: this plugin creates media library categories.

belinde

Protect folders and files from unhautorized changes managing filesystem permissions. You can configure the permission mask for file and folders in “protected” and “writeable” status, and with a single click you can switch between them. When you enable writing a cron event is set and the protected status will be applied automatically after 10 minutes.
Please check carefully the configuration before enabling protection! If the default permission mask isn’t correct for your server WordPress will stop working, and you’ll need to restore the correct permission manually.
Pay attention: the suggested configuration is, obviously, only a suggestion: depending on various system configuration the detection could be suboptimal or erroneous.
New in 0.5: automatic updates should work regularly; the protection will disabled and re-enabled, hopefully without pain. But this feature is still experimental and I can’t debug it untill next minor release of WP.

AutoCHMOD

Protect folders and files from unhautorized changes managing filesystem permissions.

XCmdr vs AutoCHMOD