Here is a list of books by the Most Venerable Mahasi Sayadaw that are hosted by Sirimangalo International.
These files are available as one zip file, either in original HTML format or ePub format (for kindle, nook, etc.):
Individual html pages are also on-line:
Anattalakkhana Sutta
Ariyavasa Sutta
Bhara Sutta
Biography
Brahmavihara Dhamma
Dhammacakkappavattana Sutta
Dhammadayada Sutta
Fundamentals of Vipassana
Hemavata Sutta
Lokadhamma
Mahasi Abroad (Pt. 1)
Mahasi Abroad (Pt. 2)
Malukyaputta Sutta
Nibbanapatisamyutta
Ovadakatha
Paticcasamuppada
Practical Vipassana Meditation Exercises
Purabheda Sutta
Purpose of Practicing Meditation
Sakkapanha Sutta
Sallekha Sutta
Sammaparibbajaniya Sutta
Satipatthana Vipassana: Criticisms and Replies
Satipatthana Vipassana Meditation
Silavanta Sutta
To Nibbana Via the Eightfold Path
Tuvataka Sutta
Vammika Sutta
Vipassana
Visuddhinanakatha
World Buddhist Missionary Tour
(source: http://www.mahasi.org.mm/)