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SyncFusion Succinctly Series of eBooks, located here , are by far the best source of free technical eBooks. They have over 150+ books written on popular software-related topics. Each book is around 100+ pages and covers the important aspects of a particular technology.
These ebooks are available for download the following formats
I used IceCream Ebook Reader for Windows found here.
SyncFusion also has Apps for Android, iOS and Windows Store. They allow offline viewing of these eBooks.
You can find the links to these apps below