Noisebud has released an update for their mastering compressor Slow. With version 1.2 you get adjustable release and by that Noisebud abandon the concept of forcing users to use slow release times but they keep the name to remind you why it was made in the first place.
Slow is PWYW but starts at $3.30.
The former version of their Fletcher-Munson based De-Harsher Smile (version 2.1), is now free. Version 2.2 that was released last week starts at $3.30.