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Top 23 C++ high-performance-computing Projects
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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.
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FluidX3D
The fastest and most memory efficient lattice Boltzmann CFD software, running on all GPUs and CPUs via OpenCL. Free for non-commercial use.
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thread-pool
BS::thread_pool: a fast, lightweight, modern, and easy-to-use C++17 / C++20 / C++23 thread pool library
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kokkos
Kokkos C++ Performance Portability Programming Ecosystem: The Programming Model - Parallel Execution and Memory Abstraction
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AdaptiveCpp
Compiler for multiple programming models (SYCL, C++ standard parallelism, HIP/CUDA) for CPUs and GPUs from all vendors: The independent, community-driven compiler for C++-based heterogeneous programming models. Lets applications adapt themselves to all the hardware in the system - even at runtime!
Project mention: AdaptiveCpp – Implementation of SYCL and C++ Parallelism for CPUs and GPUs | news.ycombinator.com | 2025-01-02 -
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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envpool
C++-based high-performance parallel environment execution engine (vectorized env) for general RL environments.
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preCICE
A coupling library and ecosystem for partitioned multi-physics and multi-scale simulations, including surface and volume coupling.
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aphros
Finite volume solver for incompressible multiphase flows with surface tension. Foaming flows in complex geometries.
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qmcpack
Main repository for QMCPACK, an open-source production level many-body ab initio Quantum Monte Carlo code for computing the electronic structure of atoms, molecules, and solids with full performance portable GPU support
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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++ high-performance-computing discussion
C++ high-performance-computing related posts
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AdaptiveCpp – Implementation of SYCL and C++ Parallelism for CPUs and GPUs
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AdaptiveCpp: Implementation of SYCL and C++ CPUs and GPUs
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AdaptiveCpp – SYCL implementation to run C++ on CPUs and GPUs
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The Way We Are Building Event-Driven Applications Is Misguided
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AdaptiveCpp
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What Every Developer Should Know About GPU Computing
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Huge LibRapid Update -- New Features, Performance Improvements and Bug Fixes
- A note from our sponsor - Stream getstream.io | 23 Dec 2025
Index
What are some of the best open-source high-performance-computing projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Taskflow | 11,484 |
| 2 | FluidX3D | 4,816 |
| 3 | thread-pool | 2,791 |
| 4 | kokkos | 2,404 |
| 5 | mfem | 2,065 |
| 6 | AdaptiveCpp | 1,759 |
| 7 | Trilinos | 1,339 |
| 8 | envpool | 1,204 |
| 9 | preCICE | 862 |
| 10 | amrex | 687 |
| 11 | thread-pool | 543 |
| 12 | relion | 510 |
| 13 | aphros | 443 |
| 14 | qmcpack | 369 |
| 15 | vuh | 350 |
| 16 | feelpp | 325 |
| 17 | ADIOS2 | 313 |
| 18 | OpenCL-Benchmark | 270 |
| 19 | intel-qs | 255 |
| 20 | mpl | 179 |
| 21 | librapid | 176 |
| 22 | vpic | 171 |
| 23 | dftfe | 152 |
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