Many refugees and people in need manufacture products and grow crops, often as their primary source of income. You can buy what they make or grow, and promote their goods to your acquaintances, thus giving them hope and confidence in integrating with their society and entering the economic cycle with the aim of building a better life.
The Prophet (pbuh) ordered every human capable of benefiting his brother in whichever way possible to do so, as he said: “He who amongst you is capable of benefiting his brother should do so”.