A group called Charitii lets users play word puzzles. You can then choose if you want them to donate to provide food, water, be put towards saving a rain forest, or contributed towards education.
Help Thirst is another game that supports water donations. It’s accessible to English Language Learners, but also seems a little weird to me. You’re shown a word question that requires a number for an answer, and you’re also shown the correct number answer. You’re supposed to memorize the answer, and then if you input it correctly, a donation is made.
JoGo Green contributes funds to an organization that plants trees. The amount is based on the number of correct answers you give to environmental-related questions — many which would be accessible to high Intermediate and Advanced English Language Learners. JoGo Green clearly tries to demonstrate proof on their website that they are actually donating the money.