Certainly all of the organizations listed can use donated materials, time, and money. However, we don't recommend blindly sending anything without either contacting the appropriate person directly or visiting the group to find out more about them. Many times import taxes, shipping costs, etc. can be eliminated using the proper channels. For example, government-funded schools have an address which items can be sent to duty free.
If there are any problems or questions, please direct them to the TB Runnins discussion board.