Custom Page Templates Setup Plugin
This plugin offers you the ability to add custom page template files to your WordPress installation without having to manage theme folders or use a ftp client. Simply upload the custom template file you have been working on and it will be registered with WordPress as a template option for your pages. This plugin is straight to the point and has a clean user interface using W3.CSS.
Feel free to let me know if you would like to see more functionality or features or if there are any bugs or vulnerabilities you notice.
Here is the link to the WordPress repository.
Here is the download link to the plugin!