Sunday, Sept. 29 is "National Coffee Day"

Ummmmmm. That morning cup of cooffee.

Sunday, Sept. 29 is National Coffee Day, and as with National Doughnut Day, there will be freebies galore. Here are the coffee shops that will give you a complimentary cup of Joe this weekend.

Dunkin' Donuts (DNKN) is doing a whole range of promotions for the day. You can get a free small coffee -- hot or iced -- when you redeem the offer on the Dunkin' Donuts mobile app. It's also discounting the price on its K-Cups and one-pound bags of coffee. Oh, and it got NASDAQ to change its name to NASDDAQ for the day on Friday, when the company came in to ring the opening bell.

APlus at Sunoco (SUN) didn't rename any stock exchanges, but it's going bigger on the free coffee. You'll be able to get a free 16-ounce coffee from any of the gas station's retail locations, and the offer will be available on Friday, Saturday and Sunday. Just get the deal through its Facebook page.

Peet's Coffee (PEET), by contrast, will only offer its free coffee during a small window on Sunday: 10 a.m. to 2 p.m. And you have to purchase a bakery item or a cup of oatmeal to get the freebie. But it's not all bad news: Instead of just getting a cup of regular old coffee, you're getting a maple latte. To get the deal, print out this coupon or show it on your smartphone.

Krispy Kreme (KKD) is getting in on the action, too. Go into any participating Krispy Kreme and you'll get a free 12-ounce coffee. And if you want something a little fancier, many locations are also offering mochas, lattes and iced coffee for just $1. You can also enter a contest that can win you a free large cup of coffee every week for a year, plus a travel mug.

Starbucks (SBUX) is giving out free coffee, though not much of it. It's using the day as an excuse to give out samples of its new "Ethiopia" coffee blend, but we imagine those will be tiny samples that aren't enough to give you a proper caffeine fix.