MIT has a new master's program on Development Economics. https://micromasters.mit.edu/dedp/
It is taught by Esther Duflo and Abhijit Banerjee, the recent Nobel Laureates. Seems cool :)
Here's a review of several courses from the program. I'm currently studying the third course out of five, and then I want to apply for on-campus accelerated Master's at MIT. I'll be happy to answer questions about the program if you have them.