This source for free e-books, articles and academic papers will probably be appreciated by very particular type of readers. Sejarah Melayu Library’s resources focus on Malay Archipelago (also called Indonesian Archipelago) and surrounding areas. All e-books, articles and academic papers are available for your Kindle for free and in .PDF format.
Basically the library has seven sections:
General section contains miscellaneous materials on Malay Archipelago that (I am guessing) do not really fit into other categories.
Histories and Other References focuses on history and geography.
Travelogue is self-explanatory: travelers’ notes about Malay Archipelago.
Language section contains dictionaries & free grammar e-books.
Fiction consists of novels, fables, poetry and other literary materials that have connections to Malay Archipelago.
Papers and Articles section has journal articles and academic papers available for downloading.
News and Dispatches has historical newspapers, gazettes, chronicles, and reports.
The layout and navigation for Sejarah Melayu Library is straightforward. Notice that you need to press the tiny plus signs in the menu, instead of the titles. There is no registration required to use these materials. All documents I checked out were in good quality PDF.
I think, this is a precious source for the scholars doing a research on Malay Archipelago; intrigued travelers planning to visit the area; and those hungry for information polymaths.
In addition to Sejarah Melayu Library’s resources, Amazon offers somewhat outdated, but free Kindle Books on this topic:
The Malay Archipelago, the Land of the Orang-utan and the Bird of Paradise; a Narrative of Travel, With Studies of Man and Nature Volume I by Alfred Russel Wallace (Volume II is also available for free); Through the Malay Archipelago by Emily Richings; and Blown to Bits The Lonely Man of Rakata, the Malay Archipelago by R. M. (Robert Michael) Ballantyne.