Here's how you can download the ROM Manager app free for Android devices.
1. Go to the Google Play page for the free app ROM Manager.
2. Tap the Install button.
Here's a description of ROM Manager:
"ROM Manager is THE MUST HAVE APP for any Android root user. (Over 10 million downloads and counting!)
* Flash your recovery to the latest and greatest ClockworkMod recovery.
* Manage your ROMs via a handy UI.
* Organize and perform backups and restores from within Android!
* Install ROMs from your SD card.
* Install your favorite ROMs over the air!"