Anki decks
One package per level: German ↔ English with Indonesian hints, articles, plurals, verb forms, example sentences and audio. Open the file with Anki (computer), AnkiDroid or AnkiMobile.
Private, non-commercial. Audio synthesised with Microsoft Edge text-to-speech for personal study. Grammar checked against Wiktionary (CC BY-SA 4.0); frequency from FrequencyWords by Hermit Dave (CC BY-SA 4.0).