NOsql Object (NO2 a.k.a Nitrite) database is an open source nosql embedded document store written in Java. It has MongoDB like API. It supports both in-memory and single file based persistent store.
Android Java NoSQL
Potassium Nitrite (KNO2) is a kotlin extension of nitrite database. It aims to streamline the usage of nitrite with kotlin by leveraging its language features like extension function, builders, infix functions etc.
Android Kotlin NoSQL