Yes. foobar2000 support BS.1770 and EBU R128 standard with oversampled "true peak" and "LU" (a replacement of VU) loudness scanner. You can scan and manually edit the desired playback level and they will be saved as metadata in your audio files.
BS.1770 suggests 4x upsampling for 44/48k contents and 2x upsampling for 88/96k contents to detect "true peaks" and has a reference algorithm. 176.4/192k or above are not required to be upsampled.
To enable oversampled peak detection, go to foobar2000's preferences and set the Peak scan oversample factor to at least 2.
ReplayGain is a widely used standard in various audio players (check Wikipedia). It stores Track peak and Album peak as metadata in audio files. Track peak is the peak of individual audio file and album peak is the highest peak of an album. In this way users can maintain the relative loudness of an album during playback.
The peak values are stored as floating point numbers and 1.0 means 0dBFS or 0dBTP if oversampled scanning is enabled. For example there is a track with 1.387928 in my screenshot, copy and paste the following line in google:
20*log(1.387928)
Which means +2.847...dBTP
in foobar2000 and other ReplayGain compliant players, you can specify the audio player to reduce the playback level according to the scanned track peak or album peak.
The "Preamp" section sets a target loudness in terms of LU. By default foobar2000 uses -18LUFS as target but as you can see, there are sliders for you to adjust. With the "prevent clipping according to peak" option selected, even if you set the slider all the way to the right, files with RG info won't clip, but in this way the target loudness cannot be maintained.
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