RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

a fast, scalable, multi-language and extensible build system

RxJava bindings for Android

Generate diagrams from textual description

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小説家になろうAPIのJavaラッパーライブラリ

C++, Java Tutorial for TDU lecture. Some algorithm Samples.