streamsupport-cfuture is a backport of the Java 8 CompletableFuture API with the current Java 9 (JEP 266) enhancements for Java 6 to 8 and Android developers

web3j is a lightweight Java library for integration with Ethereum clients

Ethereum Application Binary Interface (ABI) for working with smart contracts

Android and General Java client for Centrifugo server and Centrifuge library

Hedera™ Hashgraph SDK for Java

streamsupport-flow is a backport of the new Java 9 (JEP 266) reactive-streams Flow and SubmissionPublisher API for Java 6 to 8 and Android developers

Stream Feeds Java Client for backend and android integrations

Open Source Java API for Google Analytics. More information about the protocol is available at https://developers.google.com/analytics/devguides/collection/protocol/v1/

SDK

Core

SDK