Open-Cascade-SAS/OCCT
Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.
⚡ Executive Summary & Quick Facts
Authoritative SourceOCCT is OCCT is an open-source project written in C++: Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), Open-Cascade-SAS/OCCT has accumulated 3,035 GitHub stars and 716 forks. It is written in C++, licensed under LGPL-2.1, and ranks #3,834 globally. It is actively maintained with the latest commit recorded on Oct 19, 2026.”
| Repository | Open-Cascade-SAS/OCCT ↗ |
|---|---|
| Primary Category | 3d |
| Language & Stack | C++ |
| Software License | LGPL-2.1 |
| Community Traction | ★ 3K stars · ⑂ 716 forks · #3,834 globally |
| Maintenance | ● Active (Last commit: Oct 19, 2026) · 276 open issues |
| Target Audience | Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 92/100 · Grade AYes, OCCT is actively maintained. Continuous telemetry recorded the last code commit on Oct 19, 2026 (14 days ago). Supported by 3,035 stars and 716 community forks, this repository holds a calculated health index of 92/100, reflecting very active (commits within last 14 days) and active community feedback (276 open).
Star History
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+76
STARS · LAST 30 DAYS
3
PER DAY
#287
MOST-STARRED C++
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +76 | +270 |
| Per day | 1 | 3 | 3 |
| Forks gained | +0 | +14 | +36 |
OCCT gained 76 stars in the last 30 days, about 3 a day, and now has 3K. It is about 7 years old and has averaged roughly 434 stars a year. It ranks #287 among C++ repositories and #3,834 across all languages on GitHubRepo.
Trending Record
13
DAYS ON TRENDING
#6264
BEST RANK
Oct 19, 2026
FIRST APPEARANCE
Active
STATUS TODAY
OCCT has maintained a continuous presence across global trending indexes, peaking at #6264. Below is the 30-day activity profile:
💡 Overview
OCCT is an open-source project written in C++: Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.
Engineered for speed, consistency, and developer ease, it solves common hurdles in 3d, 3d-cad, cad. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in C++ for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/Open-Cascade-SAS/OCCT.git
cd OCCT⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
C++20 compliant compiler (GCC 11+, Clang 13+, MSVC)
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
OCCT coordinates its core functionality through a modular C++ pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed OCCT into C++ backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open LGPL-2.1 license.
🚀 Getting Started
Install OCCT using your package manager: `git clone https://github.com/Open-Cascade-SAS/OCCT.git`
Initialize your project workspace or configuration file for OCCT.
Import OCCT into your codebase or invoke it directly from your terminal.
Execute your test suite or run `OCCT --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
Open-Cascade-SAS/OCCT is currently ranked #3,834 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #3,829 | javamelody/javamelody | Java | ★ 3K | Compare ↗ |
| #3,830 | Xpra-org/xpra | Python | ★ 3K | Compare ↗ |
| #3,830 | limbonaut/limboai | C++ | ★ 3K | Compare ↗ |
| #3,832 | hashie/hashie | Ruby | ★ 3K | Compare ↗ |
| #3,832 | erupts/erupt | Java | ★ 3K | Compare ↗ |
| #3,834 | Open-Cascade-SAS/OCCT This Project | C++ | ★ 3K | |
| #3,834 | plugin87/ux-ui-agent-skills | JavaScript | ★ 3K | Compare ↗ |
| #3,836 | tox-dev/pipdeptree | Rust | ★ 3K | Compare ↗ |
| #3,836 | firebase/quickstart-ios | Swift | ★ 3K | Compare ↗ |
| #3,838 | xyproto/algernon | JavaScript | ★ 3K | Compare ↗ |
| #3,839 | QwenAudio/qwen-audio-agent | JavaScript | ★ 3K | Compare ↗ |
Frequently Asked Questions
What does OCCT do? +
Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.
Is OCCT actively maintained in 2026? +
Yes, OCCT is actively maintained. The latest code push was recorded on Oct 19, 2026 (14 days ago). It holds a calculated Maintenance Health Score of 92/100 (A rating) with 3,035 stars and 276 open issues.
What language is OCCT written in? +
The primary language is C++. Topics include: 3d, 3d-cad, cad, cae, cam.
How many stars does OCCT have? +
OCCT has 3,035 stars and 716 forks on GitHub.
How does OCCT rank among GitHub repositories? +
With 3,035 stars, Open-Cascade-SAS/OCCT is ranked #3,834 globally across all repositories tracked on GitHubRepo and #287 among C++ projects.
What license is OCCT distributed under? +
The repository reports a LGPL-2.1 license. Always verify the repository LICENSE file for legal terms.
