Is there a way to list all available packages of a PPA, before installing of any packages ? I mean, is
apt-cache able to tell this, or any other methology ?
Try Synaptic , you can see the respective available packages from the Selected PPA as here. You can select and Deselect to install and remove them. Also lists if an updated version is available.
In the y-ppa-manager window, there is a
image credit goes to original author of the link site
Note: The benefit of this software is that, you can see available packages in a PPA without even enabling that.