Simple:
grep -h -P -o "^Package: \K.*" /var/lib/apt/lists/ppa.launchpad.net_*_Packages | sort -u
Or more flexible:
grep-dctrl -sPackage . /var/lib/apt/lists/ppa.launchpad.net_*_Packages
For fancier querying, use apt-cache policy and aptitude as described here:
aptitude search '~O LP-PPA-gstreamer-developers'
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