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Top 23 C++ Java Projects
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Project mention: "Giving up upstream-ing my patches & feel free to pick them up" | news.ycombinator.com | 2026-01-31
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Project mention: Irrlicht Engine – a cross-platform realtime 3D engine | news.ycombinator.com | 2025-09-14
This, Ogre3D[0], and Wicked Engine seem to be the last of their kind
[0] https://github.com/OGRECave/ogre
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apkstudio
Open-source, cross platform Qt6 based IDE for reverse-engineering Android application packages. It features a friendly IDE-like layout including code editor with syntax highlighting support for *.smali code files.
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> You can't even clearly define what an "atomic sequence of glyphs" is.
Kinda. Grapheme cluster breaks are defined in Unicode, but they have all the baggage and edge-cases you'd expect from human languages evolving over time, so they can be encoded in as a few as a thousand rules : https://github.com/unicode-org/icu/tree/main/icu4c/source/da...
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> - NER doesn't often perform well in different domains, how accurate is the model?
https://github.com/mit-nlp/MITIE/wiki/Evaluation
The page was last updated nearly 10 years ago.
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cpeditor
The IDE for competitive programming :tada: | Fetch, Code, Compile, Run, Check, Submit :rocket:
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graaljs
GraalJS – A high-performance, ECMAScript compliant, and embeddable JavaScript runtime for Java
Project mention: Linear Matching of JavaScript Regular Expressions | news.ycombinator.com | 2025-07-17 -
react-native-mmkv-storage
An ultra fast (0.0002s read/write), small & encrypted mobile key-value storage framework for React Native written in C++ using JSI
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voyager
🛰️ An approximate nearest-neighbor search library for Python and Java with a focus on ease of use, simplicity, and deployability. (by spotify)
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Avian
[INACTIVE] Avian is a lightweight virtual machine and class library designed to provide a useful subset of Java's features, suitable for building self-contained applications. (by ReadyTalk)
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SimpleITK
SimpleITK: a layer built on top of the Insight Toolkit (ITK), intended to simplify and facilitate ITK's use in rapid prototyping, education and interpreted languages.
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MathParser.org-mXparser
Math Parser: Java, C#, C++, Kotlin, Android, and all .NET platforms (Nuget, Maven, CMake). Supports .NET Framework, .NET Core, .NET Standard, Xamarin, and more. Features: rich built-in library of math functions, operators, constants. Flexible in user-defined arguments, functions. Expressions provided as plain text. Easy to use. Well documented.
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ccapi
A header-only C++ library for interacting with crypto exchanges. Bindings for Python, Java, C#, Go, and Javascript are provided.
I work for a medium-sized proprietary/discretionary fund. AFAIK the principles trade all kinds of stuff, macro stuff. My current job is tuning up the execution on the cryptocurrency adjacent desk, but not like blockchain stuff, it's somewhere in between OG crypto trading stuff and like Wall St. HFT circa 2006-2010 depending on how you measure, it's in the "kernel bypass matters but FPGAs are still exotic" sort of regime, some of it is legacy REST APIs still but FIX 4.2 SBE and other real finance protocols (and real banks and stuff) are starting to be a part of the ecosystem.
I aspire to be a lot faster than this stuff (I've built faster stuff than this) but this is quite a good library (amazingly good by OSS standards, good stuff in this area is rarely OSS, props to the maintainers): https://github.com/crypto-chassis/ccapi, in particular this library does a really good job of being correct across a lot of surface area, it's serious people doing it, and there are forks of it that use DPDK floating around.
If by who's paying for it you mean the big Anthropic bill? My boss's boss is pretty enlightened about the fact that learning how to use AI well is expensive, so when I'm on a tight schedule I get a pretty forgiving budget for the model fees. It's a pretty serious perk in the sense that it's really expensive to master using these things :)
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microservices-framework-benchmark
Raw benchmarks on throughput, latency and transfer of Hello World on popular microservices frameworks
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Project mention: Easel Turns One One year of building my own IDE in Clojure | news.ycombinator.com | 2026-01-01
tonsky seems to be chugging along with his humbleui project
https://github.com/humbleui/humbleui
Most of the work (and the recent updates) seem to be in the two main subcomponents
https://github.com/HumbleUI/JWM
https://github.com/HumbleUI/Skija
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completely-unscientific-benchmarks
Naive performance comparison of a few programming languages (JavaScript, Kotlin, Rust, Swift, Nim, Python, Go, Haskell, D, C++, Java, C#, Object Pascal, Ada, Lua, Ruby)
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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).
C++ Java discussion
C++ Java related posts
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Open Source Project of the Day (Part 11): Supertonic - Lightning-Fast On-Device Multilingual TTS
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OsmAnd's Faster Offline Navigation
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Coccinelle: The Linux kernel's source-to-source transformation tool
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Show HN: Supertonic 2 – fast, On-Device, Multilingual TTS
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I Prefer RST to Markdown
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Instant SQL for results as you type
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AWS SnapStart - Part 27 Using insights from AWS Lambda Profiler Extension for Java to reduce Lambda cold starts
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A note from our sponsor - SaaSHub
www.saashub.com | 12 Jun 2026
Index
What are some of the best open-source Java projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | FlatBuffers | 26,056 |
| 2 | tiled | 12,626 |
| 3 | Ogre 3D | 4,594 |
| 4 | apkstudio | 4,006 |
| 5 | icu | 3,521 |
| 6 | jfx | 3,246 |
| 7 | MITIE | 2,961 |
| 8 | EPIJudge | 2,901 |
| 9 | boinc | 2,410 |
| 10 | cpeditor | 2,156 |
| 11 | graaljs | 2,006 |
| 12 | react-native-mmkv-storage | 1,751 |
| 13 | voyager | 1,574 |
| 14 | Avian | 1,236 |
| 15 | SimpleITK | 1,064 |
| 16 | MathParser.org-mXparser | 954 |
| 17 | ccapi | 725 |
| 18 | microservices-framework-benchmark | 716 |
| 19 | JamSpell | 661 |
| 20 | JWM | 634 |
| 21 | DynamixelSDK | 589 |
| 22 | completely-unscientific-benchmarks | 556 |
| 23 | java_grinder | 517 |
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