“We are hoping that volunteering becomes a more permanent change,” says Ekavi Valleras, one of the co-founders of Desmos, which not only connects donors to more than 400 nongovernmental organizations throughout Greece, but is working to change the philanthropic culture through education and advocacy work. “We want them to think about how they can be part of the solution to the crisis,” says Ms. Valleras. According to the latest Eurostat figures, Greeks are among the Europeans least likely to volunteer, with less than 10 percent of adults involved in voluntary activities.