Starting today, (October 1), the Knight Foundation is inviting anyone—architects, artists, designers, activists, hackers, and dabblers of all kind—to propose their best ideas for their Cities Challenge competition.

The private U.S.-based nonprofit has set aside $5 million to fund projects that enhance civic life in 26 U.S. cities. Now on its second year, the Cities Challenge is open to any design team in the world, and aims at funding wildly imaginative new ideas. “We’re particularly interested in ideas that knit people across the economic divide,” says Carol Coletta, who oversees the program.