jOOQ is the best way to write SQL in Java
Graphs for Everyone
Functional JDBC layer for Scala.
Compile-time Language Integrated Queries for Scala
A data access library for Scala + Postgres.
A tidy SQL-based DB access library for Scala developers. This library naturally wraps JDBC APIs and provides you easy-to-use APIs.
:leaves: Non-blocking, Reactive MongoDB Driver for Scala
Specification of the Cypher property graph query language
Fast embeddable persistent & in-memory key-value storage engine - www.SwayDB.io
Flyway SBT plugin
Asynchronous database access for Scala and Java
Mockup/testing JDBC & MongoDB driver (or Chmeee's son on the Ringworld).
Slick2 compatible blocking API for Slick3
Scala meta-DSL for the Datomic database
Scala and Java driver for FaunaDB
Type-safe SQL builder for Scala
Domain Oriented Database Mapping Framework for Scala
Type-safe and idiomatic Scala client for FoundationDB
Better JDBC wrapper for Scala
Scala Driver for ArangoDB