Developing countries does not just mean Africa, many people in India and South America (and other places are at risk from starvation, lack of clean water and feeling the effects of climate change). Rather than just throw money at big charity, here are more effective and empowering ways to help:
Donate to plant-based food charities that feed more people (and find charities that bring safe clean water to developing countries).
Power a Life makes compact powerful phone chargers that fit in your pocket, each purchase gifts a solar light to a child in school. This helps prevent chopping forests for firewood, and limits use of kerosene which is both poisonous and a fire hazard.
Kitchen Table Charities Trust was set up by former newsreader John Humphries, who was frustrated at the huge costs spent by big charity. Donations here go to help small projects in developing countries (solar panels, disability equipment, books, grants etc) with not one penny being spent on UK administration).