Voicemeeter is Audio Mixer Application endowed with Virtual Audio Device used as Virtual I/O to mix and manage any audio sources from or to any audio devices or applications.
VB-Audio VoiceMeeter vs CheVolume opinions
Not a simple app as CheVolume
Synchronous Audio Router is a software-based audio routing driver for Windows. You can create any number of Windows audio endpoints, either playback or recording, and route them using any digital audio workstation software which supports ASIO, all with low latency.Discontinued
The last version (0.13.1) was released in April 2018. Many issues in the repository going unanswered.
IndieVolume makes Windows programs use separate volume controls independent of other Windows programs.This app doesn't have any features at the moment.Discontinued
The program is no longer updated. Last version, 18.104.22.168, released in April 2013, can be still downloaded from the official website
IndieVolume vs CheVolume opinions