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Top 18 C++ Compiler Projects
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JetBrains
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This looks really cool!
A nitpick: the Verilog simulation seems to be handled by the open-source Verilator projct, which is packaged as a binary WASM blob without any acknowledgement or source code. I don't think that's compliant with either of the licenses under which Verilator is distributed (LGPL-3.0 or Artistic License).
https://github.com/verilator/verilator
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vast
VAST is an experimental compiler pipeline designed for program analysis of C and C++. It provides a tower of IRs as MLIR dialects to choose the best fit representations for a program analysis or further program abstraction.
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Sevalla
Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!
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jet
A Fast C and Python like Programming Language that puts the Developer first. WIP (by The-NextGen-Project)
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Project mention: Show HN: Compiling C in the browser using WebAssembly | news.ycombinator.com | 2024-10-07
This is true. In Theta (https://github.com/ThetaLang/Theta) this is exactly what we do -- no need for more than one pass for the WASM codegen.
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checkedc-llvm-project
This was a fork of Checked C clang used from 2021-2024. The changes have been merged into the original Checked C clang repo, which is now at https://github.com/checkedc/checkedc-clang.
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opcplusplus
compiler for c++ headers with custom attributes/modifiers via dialects, outputs generated src/h, xml definitions, mirrored reflection structure, fast dynamic casts. memory stack only, no heap allocations. supports c++03. translating compiler technology similar to babel and typescript .
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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++ Compilers discussion
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Verilator: Open-Source SystemVerilog simulator and lint system
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What's new for RISC-V in LLVM 17
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Module interfaces for pre-built libraries
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A new design pattern: the C++ "template mixin"
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How to run & simulate system verilog files on VScode?
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A note from our sponsor - JetBrains
surveys.jetbrains.com | 1 Sep 2025
Index
What are some of the best open-source Compiler projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Modern-CPP-Programming | 13,705 |
| 2 | llvm-tutor | 3,256 |
| 3 | verilator | 3,047 |
| 4 | mlir-tutorial | 1,061 |
| 5 | vast | 421 |
| 6 | ipr | 229 |
| 7 | buildit | 179 |
| 8 | wasp | 115 |
| 9 | noelle | 79 |
| 10 | MimIR | 72 |
| 11 | GrayC | 59 |
| 12 | jet | 41 |
| 13 | Theta | 39 |
| 14 | mewa | 23 |
| 15 | ShnooTalk | 20 |
| 16 | checkedc-llvm-project | 18 |
| 17 | expr-ir | 3 |
| 18 | opcplusplus | 1 |
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