Fully compliant with EBU R128 and ITU-R BS 1770-3 standards.
Offers 64-bit processing with support for high sample rates (192kHz or higher) and fast algorithms optimized for modern CPUs. It is free: Part of the massive MFreeFXBundle . meldaproduction-presents-mloudnessanalyzer-plugins-download
Here is a review of its features, pros, and cons based on available information. Overview & Key Features Fully compliant with EBU R128 and ITU-R BS 1770-3 standards
Supports mono, stereo, mid/side encoding, and up to 8 channels of surround audio (up to 7th order Ambisonics). meldaproduction-presents-mloudnessanalyzer-plugins-download
Features a resizable GUI with a time-graph view for visualizing loudness changes over time.