Quickly review the NVRAM variables currently active on your Mac. Check efi-boot-device, boot-gamma, boot-args, backlight-level, SystemAudioVolume, fmm-mobileme-token-FMM, luetoothInternalControllerInfo, prev-lang:kbd, SystemAudioVolumeDB, platform-uuid, etc.
The 1.4 version of NVRAMme for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely System Optimization. This free Mac app was originally produced by InsanelyMac. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
It's a top bar application that quickly shows you all NVRAM variables stored in your Mac or Hack.
The application has a built-in icon which leads to the official website in case the user wants to check for updates with a few clicks. It also can be configured to run when the Mac starts.
You may want to check out more Mac applications, such as Peek-a-Boo or DiskFire, which might be similar to NVRAMme.