MuVerb is a very nice sounding reverb plug-in that adds reverberation on the incoming audio.
MuVerb is integrated into MuLab and MUX Modular Plug-in,
and it is also available as a free VST plug-in for Windows and MacOS.
MuVerb 7.4.7 Windows 64 bit VST Plug-in
MuVerb 7.4.7 Windows 32 bit VST Plug-in
MuVerb 7.4.7 MacOS 64 bit VST Plug-in
Installation notes are similar to the MUX Modular Installation notes.