Developers, belly up to the bar, because it’s last call for alcohol time to submit your apps ahead of the upcoming OS X Mountain Lion launch. The call is also a reminder to developers to log into their Mac Dev Center accounts and download the just released Xcode and OS X Mountain Lion Golden Masters.

Make sure your apps take advantage of the great new features in OS X Mountain Lion when the world’s most advanced operating system ships to millions of customers worldwide. Download OS X Mountain Lion GM seed and Xcode 4.4 GM seed, now available on the Mac Dev Center. Build your apps with these latest seeds, then test and submit for review — Apple email to developers.

Additionally, devs can also submit iOS apps that take advantage of the new cross-platform Game Center Groups, so they will be available day and date when OS X Mountain Lion ships — the current scuttle butt has Mountain Lion arriving on Wednesday, July 25.

So, developers, head on over to the Mac Dev Center, log in and get busy — it’s becoming clear that the OS X Mountain Lion launch is coming soon, very soon

Will you be upgrade on Mountain Lion launch day?

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