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Top 23 C++ Plugin Projects
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JUCE
JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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obs-backgroundremoval
An OBS plugin for removing background in portrait images (video), making it easy to replace the background when recording or streaming.
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if you mean you just want to make music and arent too bothered about recording then Cardinal is a free modular eurorack synth you could mess around with
or you use a VST host like Kushview's Element and load up on all the free VST instruments and effects that are out there. you would just need a midi keyboard hooked to it then or use Cardinal to generate note patterns
https://cardinal.kx.studio
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Project mention: Show HN: Contrapunk – Real-time counterpoint harmony from guitar input, in Rust | news.ycombinator.com | 2026-04-04
Nicely done! I saw you're building a cloud version so wanted to refer the excellent https://github.com/sonosaurus/sonobus which you might be able to integrate. All the best!
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Project mention: Show HN: Moonshine Open-Weights STT models – higher accuracy than WhisperLargev3 | news.ycombinator.com | 2026-02-24
I've helped many Twitch streamers set up https://github.com/royshil/obs-localvocal to plug transcription & translation into their streams, mainly for German audio to English subtitles. I'd love a faster and more accurate option than Whisper, but streamers need something off-the-shelf they can install in their pipeline, like an OBS plugin which can just grab the audio from their OBS audio sources. Also this doesn't seem to support translation which is unfortunate, that's pretty key for this usecase.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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pamplejuce
A JUCE audio plugin template. JUCE 8, Catch2, Pluginval, macOS notarization, Azure Trusted Signing, Github Actions
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Vaporizer2
Vaporizer2 hybrid wavetable additive / subtractive VST / AU / AAX synthesizer / sampler workstation plugin
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obs-ios-camera-source
Use your iPhone camera as a video source in OBS Studio and stream high quality video from your iPhone's camera over USB
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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++ Plugin discussion
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Tell HN: Wireshark has a new sibling: Stratoshark
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Show HN: AOO – real-time audio streaming and messaging
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Batteryless OP-1
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Cardinal – Virtual modular synthesizer plugin
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A note from our sponsor - AppSignal
www.appsignal.com | 8 Oct 2026
Index
What are some of the best open-source Plugin projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | JUCE | 8,948 |
| 2 | obs-backgroundremoval | 4,586 |
| 3 | input-overlay | 4,199 |
| 4 | Cardinal | 3,212 |
| 5 | sonobus | 2,195 |
| 6 | obs-localvocal | 1,619 |
| 7 | HoudiniEngineForUnreal | 1,607 |
| 8 | ALS-Refactored | 1,499 |
| 9 | Camomile | 989 |
| 10 | godot-git-plugin | 953 |
| 11 | KlakSpout | 821 |
| 12 | pamplejuce | 762 |
| 13 | master_me | 751 |
| 14 | DlgSystem | 643 |
| 15 | UE4VoxelTerrain | 590 |
| 16 | Vaporizer2 | 582 |
| 17 | plumed2 | 520 |
| 18 | vlc-bittorrent | 503 |
| 19 | obs-ios-camera-source | 418 |
| 20 | EaglePatch | 366 |
| 21 | UltimateStarterKit | 353 |
| 22 | UE-BUITween | 320 |
| 23 | QtFirebase | 289 |
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