Frontier
by D16 Group

Free adaptive limiter from D16 with a self-adjusting release, usable on single tracks, busses or the master.
Frontier is D16's free limiter with an adaptive release time that adjusts itself to the input signal, so it needs very little tweaking to sound clean. You set threshold and output and pick soft or hard knee, which makes it a quick loudness tool on drum busses and full mixes. It is free of charge but you need a free D16 Group account to download it.
In action
Video plays from YouTube when started.
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VST3 VST2 AU·Windows macOS