Instacast by Vemedio, a popular podcast app, has previously been available only for the iPhone and iPad but is now available as a public beta for Mac.
Since it’s still in beta, there’s likely to be a few bugs that will need tweaking, but you can download it now to give it a try. You can login to the same account that you use on your iOS device. Organize your podcasts by adding new lists and categorizing them however you want and star your Favorites in case you want to remember them for later.
Instacast for Mac beta is available to download now on the Vemedio website and it works with OS X 10.8 or higher.