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When the inevitable 5:30 PM thought, "What am I making for dinner tonight?" pops into your head this evening, try one of these three sites that offer fantastic (and free) help.

Gojee
How it works: You tell Gojee which ingredients you have on hand and which ones you don't like or are allergic to. It then pulls up recipes that meet your criteria, from food blogs like Not Eating Out in New York and Sassy Radish. Beautiful, screen-wide photographs make every recipe look like a winner.
Best for: CSA subscribers with specific tastes, who are trying to figure out what to do with seven pounds of zucchini or three huge bunches of kale.

Food on the Table
How it works: You build a profile, finding your local grocery store on the site's map, selecting which proteins (e.g., pork, beef, fish) you love, and picking which kinds of meals you want to always, sometimes or never make (e.g., heart-healthy, vegan, Italian, kid-friendly). Then, the site creates weekly meal plans with recipes and grocery lists based on that information, and tells you if any of the necessary ingredients are on sale at your store. There's a mobile app, too.
Best for: Heads of households who have a life outside of cooking dinner for their family.

Punchfork
How it works: The site uses real-time data like tweets and Facebook shares to measure which recipes people are talking about online. It rates each recipe from 1 to 100; the higher a recipe's score, the more it has been talked about and shared on the web. New recipes appear minutes after they're published, and the site has a sleek, magazine-like visual layout.
Best for: Foodies who want to make of-the-moment dishes, which might be Blueberry Ketchup one day and tacos made with Pillsbury Grands! refrigerated buttermilk biscuits the next.