Other developers on the show floor aren’t in the Mac App Store at all yet, though they want to be. BusyMac’s BusyCal isn’t in the store, but should be there by next month, according to co-founder John Chaffee. In fact, he said that the version of BusyCal being demoed on the show floor actually was the Mac App Store build, which just hasn’t been submitted to Apple for review.

e3 Software said that it would love for to appear on the Mac App Store, but that the software’s been in review since mid-November 2010. Developer frustrations about slow, silent review periods seem to have been ported over directly from the iOS App Store.

Nuance Senior Vice President and General Manager, Peter S. Mahoney, said that he’d love to see (née MacSpeech Dictate) in the Mac App Store—especially considering how well the has performed on the iOS App Store—but the company can’t submit the app “as we know it today.” That’s because the app uses private APIs, which Apple doesn’t allow for Mac App Store apps. Mahoney acknowledged that the store is an important tool for reaching a certain sector of Apple consumers, who will now only buy software if they can find it on the Mac App Store.

Paul Kafasis, CEO of , said that his company faces a similar challenge. Because most of the company’s commercial software requires either root access, private APIs, or both, Apple won’t allow them in the Mac App Store. Rogue Amoeba would thus need to create what Kafasis called “neutered” versions of its apps—limited in feature set—to get allowed into the store.