I use a lot of PPA's. I'd like to check if all of them have packages for Saucy before updating.
Is there a program which checks whether my PPAs have packages for a different version of Ubuntu?
This can be scripted... It'll need altered versions of two of my previous answers: one to get a list of all the PPAs and another to check if a URL is live. With those two techniques we can build a real launchpad URL and test it.
It's an ugly script but it's so beautiful at the same time.
I don't know of any software to do that, but from the PPA's webpage it is easy to check, by deploying the list in section "Overview of published packages" (see the image below).
If you use really a lot of PPAs, this can get tiring.
Perhaps an internet crawling script might help? With that I couldn't help you much, though.
Image taken from this Q&A in ask.libreoffice.org.