Probably the largest collection of HEMA resources is Wiktenauer  where you can find a vast majority of the manuscripts and technics, with original texts and translation. However, there are not that many you can download, if you want, like me, to be able to print them.
Therefore I have tried to compile a library of downloadable manuscripts that is available online.

• Below I tried to make som sort of attempt to divide them, which is difficult as many span over multiple genres. But I tried to make easy and divded them, so far, into fencing (which include both on foot and mounted, and general battle tactics) and then one in horsemanship, which are treatises more on riding and horse training. 
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Wiktenauer compilations:

Andres Lignitzer – Short Sword and Sword and Bucklery

Online collections

Svenska HEMA förbundet – manuscripts translated to Swedish