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《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现
Termux - a terminal emulator application for Android OS extendible by variety of packages.
RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
Netty project - an event-driven asynchronous network application framework
High Performance Inter-Thread Messaging Library
A high performance caching library for Java
Vert.x is a tool-kit for building reactive applications on the JVM
The Java gRPC implementation. HTTP/2 based RPC
Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.
Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …
Reactive Streams Specification for the JVM
H2 is an embeddable RDBMS written in Java.
OFD Reader & Writer 开源的OFD处理库，支持文档生成、数字签名、文档保护、文档合并、转换、导出等功能，文档格式遵循《GB/T 33190-2016 电子文件存储与交换格式版式文档》。
Rapidoid - Extremely Fast, Simple and Powerful Java Web Framework and HTTP Server!
ActiveJ is an alternative Java platform built from the ground up. ActiveJ redefines core, web and high-load programming in Java, providing simplicity, maximum performance and scalability
Digitally sign PDF files from your commandline
XiPKI: Compact open source PKI (CA, OCSP responder, certificate protocols ACME, CMP, EST, SCEP), with full support of PQC MLDSA (Dilithium) and MLKEM (Kyber).
JavaClaw, a Java version of OpenClaw built on Spring Boot, Spring AI and JobRunr
https://openjdk.org/projects/code-tools/jcstress
Tencent Kona SM Suite contains a set of Java security providers, which support algorithms SM2, SM3 and SM4, and protocols TLCP/GMSSL, TLS 1.3 (with RFC 8998) and TLS 1.2.