How to uninstall SaltyBeer Skype call recorder?
According to this answer:

I found package ID with pkgutil:

$ pkgutil --packages | grep saltybeer
com.saltybeer.pkg.saltybeer


To find out paths of installed payload:

$ pkgutil --files com.saltybeer.pkg.saltybeer
Contents
Contents/Info.plist
Contents/MacOS
Contents/MacOS/saltybeer
plugins
plugins/saltybeer.bundle
plugins/saltybeer.bundle/Contents
plugins/saltybeer.bundle/Contents/Info.plist
plugins/saltybeer.bundle/Contents/MacOS
plugins/saltybeer.bundle/Contents/MacOS/cocoa_ui
plugins/saltybeer.bundle/Contents/Resources
plugins/saltybeer.bundle/Contents/Resources/._Info.plist
plugins/saltybeer.bundle/Contents/Resources/Assets.car
plugins/saltybeer.bundle/Contents/Resources/Info.plist
plugins/saltybeer.bundle/Contents/Resources/MainMenu.nib
plugins/saltybeer.bundle/Contents/_CodeSignature
plugins/saltybeer.bundle/Contents/_CodeSignature/CodeResources


Then to find out the location of installation:

$ pkgutil --pkg-info com.saltybeer.pkg.saltybeer
package-id: com.saltybeer.pkg.saltybeer
version: 2.0
volume: /
location: Library/Audio/Plug-Ins/HAL/saltybeer.plugin
install-time: 1477419357


I changed the current working directory:

$ cd /Library/Audio/Plug-Ins/HAL/saltybeer.plugin


And deleted installed files:

$ pkgutil --only-files --files com.saltybeer.pkg.saltybeer | tr '\n' '\0' | xargs -n 1 -0 sudo rm -if


And directories:

$ pkgutil --only-dirs --files com.saltybeer.pkg.saltybeer | tail -r | tr '\n' '\0' | xargs -n 1 -0 sudo rmdir


Then I removed package receipt:

$ sudo pkgutil --forget com.saltybeer.pkg.saltybeer
Forgot package 'com.saltybeer.pkg.saltybeer' on '/'.


and finally to remove plugin directory:

$ cd /Library/Audio/Plug-Ins/HAL
$ sudo rm -rf saltybeer.plugin


Done!