Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.
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🚀 A Complete Fast Android Networking Library that also supports HTTP/2 🚀
Simple Binary Encoding (SBE) - High Performance Message Codec
- codec
- java
- c-plus-plus
- golang
Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
- java
- intellij
- json
- template-engine
Open-source framework for native apps from one Java codebase, with a custom-rendered UI you control across iOS, Android, desktop, web, and watches.
- cross-platform
- java
- kotlin
- android
🦎 A lightweight, streaming-native, multi-protocol gateway for AI, APIs, and real-time data. Route LLM requests across providers, govern MCP tools, and connect Kafka, MQTT, and HTTP through one high-performance engine with shared security and observability.
Simple API, Complex Emails (Jakarta Mail smtp wrapper)
- java
- java-mail
- outlook
- batch-processing
Fast, lightweight, and RFC 4180 compliant CSV library for Java. Zero dependencies, ~90 KiB. Trusted by Apache NiFi, JUnit, and Neo4j.
- csv
- java
- csv-parser
- csv-reader
API Gateway bridging modern and legacy APIs with WSDL-to-OpenAPI, SOAP-to-REST, XML, OAuth2, and GraphQL.
🔐 An SSL library for configuring http client or server. Rich with features such as hot reloading ssl and trusting additional certificates during runtime, combining multiple keystores, loading pem files and os/jdk certificates, logging certificate information during ssl handshake, bypassing ssl configuration from other libraries and more
Convert Java to JSON/TOON and back. Supports complex object graphs, cyclic references, and TOON format for 40-50% LLM token savings. JDK 8+
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Modern Clojure HTTP server and client built for ease of use and performance
- clojure
- java
- http-server
- http-client
JVM support for Apollo Federation
- federation
- graphql
- java
- spring-graphql
A JAX-RS like annotation processor for vert.x verticals and more
Efficient, asynchronous batching and caching in clustered environments, port of Facebook DataLoader
- facebook-dataloader
- vertx-dataloader
- graphql
- java-8
Read and write Excel (.xlsx, .xls), CSV, and ODS files in Java with one line of code. Annotation-based mapping, SAX streaming, built-in validation, 19 type converters, cell styling. A high-performance alternative to Apache POI.
- annotation
- apache-poi
- csv
- data-processing
Log4j, Knockout.js, WebSockets and Play! Log4Play is a module that provides a log4j appender which publishes log entries to an EventStream. The module also provides an user interface which uses a WebSocket creating a live stream of log messages. You can use this user interface to look at the logs of your application without needing to login to the actual box.
Modern & Powerful Telegram-bot-api framework/library with custom features!
- bot-framework
- java
- java17
- java21
Small example showing how to use vertx-grpc client in order to target a running dgraph service