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Top 23 C++ Java Projects
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This article was just a warmup, a kind of sandbox to see the capabilities of Protocol Buffer. At the same time, I was also looking to the FlatBuffers protocol trying to identify the difference between both format. I would prefer to use CBOR for my projects, but I would also like to avoid using too much dependencies from unknown repositories. Furthermore, protobuf Dart package is already used by Dart and Flutter (for metrics IIRC), it can also be used for messaging as well.
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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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Project mention: Solving 20 Erdős Problems with 20 Codex Accounts Running in Parallel | news.ycombinator.com | 2026-07-15
Exceptional work. Reminds me of https://www.distributed.net/Main_Page and https://boinc.berkeley.edu/. Consider scaling up by distributing this work more broadly. "Many hands make light work."
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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
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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.
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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 | 17 Aug 2026
Index
What are some of the best open-source Java projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | FlatBuffers | 26,334 |
| 2 | tiled | 12,819 |
| 3 | Ogre 3D | 4,633 |
| 4 | apkstudio | 4,607 |
| 5 | icu | 3,576 |
| 6 | jfx | 3,274 |
| 7 | MITIE | 2,961 |
| 8 | EPIJudge | 2,908 |
| 9 | boinc | 2,449 |
| 10 | cpeditor | 2,168 |
| 11 | graaljs | 2,026 |
| 12 | react-native-mmkv-storage | 1,752 |
| 13 | voyager | 1,589 |
| 14 | Avian | 1,238 |
| 15 | SimpleITK | 1,083 |
| 16 | MathParser.org-mXparser | 953 |
| 17 | ccapi | 729 |
| 18 | microservices-framework-benchmark | 715 |
| 19 | JamSpell | 661 |
| 20 | JWM | 639 |
| 21 | DynamixelSDK | 600 |
| 22 | completely-unscientific-benchmarks | 557 |
| 23 | java_grinder | 525 |
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