
The ArtScroll Digital Library is the publisher's own app, and it carries the ArtScroll and Mesorah editions in digital form — the Schottenstein Talmud most notably, along with siddurim, machzorim, chumashim and their wider catalogue.
The Schottenstein edition is why most people install it. It presents the Talmud with the traditional page reproduced alongside a phrase-by-phrase elucidated translation, with the inserted explanation typographically distinct from the text itself — an approach that made the Talmud approachable for a great many readers, and which the app reproduces faithfully.
Audio accompanies parts of the catalogue, and tools cover bookmarks, notes, search and cross-references between works.
Worth being clear about the model before installing: the app is free but the volumes are purchased. This is a publisher's library, not a free text collection — for that, Sefaria is the app in this list.
Android and iOS.
Mesorah Publications, publishing as ArtScroll, produces the Schottenstein Talmud and a wide catalogue of Jewish texts; this is its own digital library app.