This is the last version of AnkiDroid 1.x.
It is completely unsupported, and many features such as sync and shared decks do not work.
AnkiDroid-1.1.3.apk is the standard version
AnkiDroid-1.1.3_parallel.apk is like 1.1.3 but the namespace has been changed to com.ichi2.anki1 so that it can be installed on the same device as the current version of AnkiDroid (2.x, with namespace com.ichi2.anki)
Documentation can be found here for a limited time