Blender Market: Render+

The Render+ addon by januz adds a couple of useful options to Blender such as notifications and switching off your computer when the render is done.
Render+ is a Blender addon that helps you save time and frustration when rendering.
Features:
- Render in the background- Runs the rendering in a separate process without an interface, so you can close Blender and your render will continue silently.
- Desktop Notifications (Linux and OS X only)- A message will pop in your desktop once rendering is finished.
- Preview Render – Start an OpenGL render using the active camera with invisible objects hidden (lamps, cameras, etc). Easily check animations before commiting to a full render.
- Pre and Post-render actions – For advanced users that want to run specific commands or Python scripts before or after rendering. You can use this to upload rendered files to a FTP server, send emails and more!
- Autosave – Automatically save image renders to your output folder.
- Show rendertime for an animation – See the full time it took to render an animation from the first frame to the last.
- Enable all layers in 3D View before rendering – Ever left Blender rendering for hours only to find you forgot to turn on a layer? Never again! Render+ does it for you.
- Turn off after rendering – Set the computer to sleep or shut down when rendering is finished so you can save power.
Render+ sells for $12 on the Blender Market.

Waiting for batch rendering of external blends to make some kind of a render queue