Not sure whether you mean that you want to buy something for a developing country and tell your relatives/friends about it, if so see
http://www.good-gifts.org/goodgifts/
OR if you mean that you'd like to buy presents for your friends/family which is also helping someone else, in which case most charities do catalogues at this time of year, so that any gifts you buy a percentage goes to the charity. Just choose your favourite charity (Oxfam? RNLI? or whatever) and contact them.