Youlean has released Freq-Balancer, a frequency analysis/equalizer effect plug-in designed for mastering.
Freq-Balancer analyzes the frequency content of an audio signal and automatically applies an equalizer that evens out the frequency balance towards a curve found on many commercial tracks.
When Freq-Balancer analyses audio, it measures the audios frequency content over a period of time. It splits the incoming audio signal into 7 frequency bands. Then it measures and compares the audio levels within each band. Finally it applies EQ to compensate for any uneven frequency balance.
The plug-in is available for Windows (32-bit VST) as donationware.