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Top 23 Java Python Projects
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Project mention: Top 7 Puppeteer Alternatives for Web Automation and Testing (2025) | dev.to | 2025-08-05
Selenium is one of the most popular and mature automated testing frameworks for web applications. Unlike Puppeteer, which is limited to Chromium, Selenium supports all major browsers—including Chrome, Firefox, Safari, and Edge—making it a reliable choice for Cross-platform browser testing.
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Project mention: Performance Test: Flink 1.19 vs. Spark 4.0 vs. Kafka Streams 3.8 Windowed Aggregation Throughput | dev.to | 2026-05-04
Solution & Implementation: Migrated windowed aggregation from Kafka Streams 3.7 to Flink 1.19, reusing existing Kafka sources/sinks. Optimized Flink config: set parallelism to 16 (matching vCPU), enabled RocksDB state backend with 100ms watermark out-of-order tolerance, configured 5s checkpoints. Trained team on Flink watermarking and state management via Apache Flink GitHub repo documentation.
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ANTLR
ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.
Project mention: RCParsing VS ANTLR - a user suggested alternative | libhunt.com/r/RCParsing | 2025-09-19ANTLR is a lexer-based, powerful tool for creating own DSL and analyzing them. But it's and overkill for simple languages (JSON, for example), while RCParsing is good for both complex and simple languages, allows you to choose: work with AST or immediately calculate value while parsing.
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Deeplearning4j
Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...
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aws-doc-sdk-examples
Welcome to the AWS Code Examples Repository. This repo contains code examples used in the AWS documentation, AWS SDK Developer Guides, and more. For more information, see the Readme.md file below.
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Project mention: Architecture Teardown: How Meta Trains LLMs for Code Generation on 100k GPU Clusters | dev.to | 2026-04-29
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QR-Code-generator
High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.
Project mention: Fully vector QR codes with an SVG logo in React (download as scalable SVG) | dev.to | 2026-06-08That's what react-quick-response does. It renders the QR code as SVG (the encoding is handled by Project Nayuki's well-known QR Code generator library, bundled in — no extra runtime dependency), and it lets you pass an SVG logo as a child that stays vector too.
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AndroRAT
A Simple android remote administration tool using sockets. It uses java on the client side and python on the server side
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fory
A blazingly fast multi-language serialization framework for idiomatic domain objects, schema IDL, and cross-language data exchange.
Project mention: Extend Protobuf/FlatBuffers Schema IDL with Shared/Circular Reference Support | news.ycombinator.com | 2026-03-11If you already have .proto or .fbs schemas and you want shared/circular reference support, with the Fory compiler you can keep those schemas, add a small set of Fory options, then foryc generates idiomatic native models across Fory-supported languages
With fory first-class object graph serialziation support, you can serialize object graphs without manual *_id link reconstruction or rewriting your entire schema into Fory Schema.
1. GitHub: https://github.com/apache/fory
2. Compiler docs: https://fory.apache.org/docs/compiler
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open-location-code
Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.
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LakeSoul
LakeSoul is an end-to-end, realtime and cloud native Lakehouse framework with fast data ingestion, concurrent update and incremental data analytics on cloud storages for both BI and AI applications.
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CloudStack
Apache CloudStack is an opensource Infrastructure as a Service (IaaS) cloud computing platform
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Project mention: Top Open-Source Data Engineering Tools- Unravelling the Best in 2026 | dev.to | 2025-12-10
Ambari
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ghidra-mcp
Ghidra MCP Server — 200+ MCP tools for AI-powered reverse engineering. GUI plugin + headless server, lazy tool loading, convention enforcement, batch operations, Ghidra Server integration, and Docker deployment.
Project mention: MCP's Dark Secret: 5 Hidden Patterns Nobody Teaches You About Context Window Optimization | dev.to | 2026-04-30# Lazy-loading MCP: Only activate server when actually needed # Inspired by GhidraMCP's lazy tool loading pattern # https://github.com/bethington/ghidra-mcp class LazyMCPLoader: def __init__(self, server_registry: dict): # Server registry stores metadata, NOT active connections self.server_registry = server_registry self.active_servers = {} async def invoke(self, tool_name: str, params: dict): server_name = self._resolve_server(tool_name) # Lazy initialization — server starts only on first use if server_name not in self.active_servers: print(f"🔌 Lazy-loading MCP server: {server_name}") self.active_servers[server_name] = await self._start_server( self.server_registry[server_name] ) return await self.active_servers[server_name].invoke(tool_name, params) async def invoke_batch(self, tools: list): """Pre-warm servers for tools likely to be used together""" servers_needed = {self._resolve_server(t['tool']) for t in tools} for srv in servers_needed: if srv not in self.active_servers: self.active_servers[srv] = await self._start_server( self.server_registry[srv] ) # Now all servers are pre-warmed for parallel execution return await asyncio.gather(*[ self.active_servers[self._resolve_server(t['tool'])].invoke(t['tool'], t['params']) for t in tools ]) # Register servers — this is ALL that loads into context at startup # 500 bytes vs 50,000 bytes of tool definitions SERVER_REGISTRY = { "github": {"host": "localhost", "port": 3100, "tools": 23}, "filesystem": {"host": "localhost", "port": 3101, "tools": 8}, "ghidra": {"host": "localhost", "port": 3102, "tools": 110}, # Lazy loaded }
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Project-Euler-solutions
Runnable code for solving Project Euler problems in Java, Python, Mathematica, Haskell. (by nayuki)
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Timefold Solver
The open source Solver AI for Java and Kotlin to optimize scheduling and routing. Solve the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning problems.
Project mention: Last fifty years of integer linear programming: Recent practical advances | news.ycombinator.com | 2025-06-17 -
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java Python discussion
Java Python related posts
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Interesting links - May 2026
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7 Free Tools for Data Pipeline Reconciliation and Cross-Source Validation
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Apache Flink VS sail - a user suggested alternative
2 projects | 18 Mar 2026 -
JPEG Compression
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JSciPy – The trending Java signal processing library in 2026
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Show HN: JSciPy – SciPy-inspired signal processing library for Java and Android
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jSciPy: A Practical SciPy-Inspired Scientific Computing and Signal Processing Library for Java & Android
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A note from our sponsor - SaaSHub
www.saashub.com | 14 Jun 2026
Index
What are some of the best open-source Python projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Selenium WebDriver | 34,191 |
| 2 | Apache Flink | 26,068 |
| 3 | ANTLR | 18,910 |
| 4 | Deeplearning4j | 14,235 |
| 5 | aws-doc-sdk-examples | 10,423 |
| 6 | beam | 8,610 |
| 7 | QR-Code-generator | 6,527 |
| 8 | AndroRAT | 4,719 |
| 9 | fory | 4,407 |
| 10 | open-location-code | 4,329 |
| 11 | Apache Avro | 3,275 |
| 12 | LakeSoul | 3,240 |
| 13 | CloudStack | 2,944 |
| 14 | javacpp-presets | 2,846 |
| 15 | sedona | 2,336 |
| 16 | ambari | 2,304 |
| 17 | ghidra-mcp | 2,401 |
| 18 | Project-Euler-solutions | 1,957 |
| 19 | Timefold Solver | 1,681 |
| 20 | plc4x | 1,579 |
| 21 | pysonar2 | 1,421 |
| 22 | hopsworks | 1,294 |
| 23 | py4j | 1,288 |
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