Earth Observatory Library: Tropical Rainfall Measuring Mission
- Offers an overview of the program, discussion of science results, and instrument details.
- http://earthobservatory.nasa.gov/Library/TRMM/

JAXA - TRMM
- Information, photos, and data from the Earth Observation Research Center of Japan Aerospace Exploration Agency.
- http://www.eorc.jaxa.jp/TRMM/index_e.htm

TRMM Science Data and Information System (TSDIS)
- Analyzes the rainfall data, provides validation from nearly a dozen ground radar sites, and distributes data products to the science community.
- http://tsdis.gsfc.nasa.gov/

Tropical Rainfall Measuring Mission (TRMM)
- A joint NASA and JAXA mission to monitor and study tropical rainfall. Includes mission background, news, publications, current images, and data access.
- http://trmm.gsfc.nasa.gov/

Wikipedia - Tropical Rainfall Measuring Mission
- Includes an overview of the program and summary of specifications.
- http://en.wikipedia.org/wiki/Tropical_Rainfall_Measuring_Mission