It is often hard to know what charity to give to, maybe there is a personal reason to give to one in particular. If you are looking to give it is often perhaps best to follow your heart. However, if you would like some suggestions I have listed a few, just click on the names.
Apart from those listed below there is also a Christian organisation called Compassion, which allows you to develop a one-on-one relationship with a child in need. You actually choose a child to support and help bring them out of poverty, so you deliver help and see it actioned. It is a rewarding experience, one that is controlled and implemented by local churches around the world. The child learns about God by hearing the Gospel and getting a Christian education. I would certainly recommend checking it out.