Open-Cascade-SAS/OCCT

Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.

View on GitHub ↗Jump to charts ↓Open shareable report →

Open-Cascade-SAS/OCCT has 3k+ stars and 700+ forks on GitHub, is written in C++, and was last pushed on Oct 15, 2026. Data as of . Signed-in members get hourly updates — create a free account.

Summary Information

Updated 1 hour ago
Added to GitGenius on October 13th, 2026
Created on March 16th, 2020
Open Issues & Pull Requests: 274 (+0)
GitHub issues: Enabled
Number of forks: 713
Total Stargazers: 3,029 (+1)
Total Subscribers: 56 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 5.8 hours
Mean response time: 12.5 days
90th percentile: 25.6 days
Tracked items: 250

How this project is maintained

Roughly one issue in two opened in the past year never receives a reply. 76% of open issues come from outside the core team, so the backlog reflects real-world use rather than internal planning. 44% of tracked open issues have had no activity in three months. Only 31% of issues opened in the past year have been closed. Three people close 94% of everything that gets resolved.

Charts & Analytics

Fetching additional details & charts...

Issue Activity (beta)

Open issues: 189
New in 7 days: 11
Closed in 7 days: 1
Avg open age: 204 days
Stale 30+ days: 143
Stale 90+ days: 106

Recent activity

Opened in 7 days: 11
Closed in 7 days: 1
Comments in 7 days: 5
Events in 7 days: 25

Top labels

  • 0. New (223)
  • 2. Bug (209)
  • 1. Modeling (69)
  • 1. Data Exchange (61)
  • 2. Enhancement (59)
  • 7. FreeCAD (38)
  • 0. Good candidate (37)
  • 3. Not validated (29)

Most active issues this week

Sign in to see which issues are moving.
Sign in

Detailed Description

Open CASCADE Technology is a C++ software development platform for 3D CAD, CAM, and CAE applications.

The tool addresses the need for robust geometric modeling and CAD data handling by providing a comprehensive library of C++ services for 3D surface and solid modeling, CAD data exchange, and visualization. Its architecture centers on modular C++ libraries that developers can integrate into applications requiring 3D geometric computation, manufacturing simulation, or numerical analysis capabilities.

Developers should adopt this tool if building applications that demand sophisticated 3D modeling, CAD file interchange, or engineering simulation features. It suits projects in mechanical design, manufacturing planning, or scientific computing where geometric algorithms and data structures are core requirements. The tool is available in multiple distribution forms: source snapshots with build scripts and CMake configuration, complete source archives with generated documentation, and platform-specific binary packages that enable immediate use without compilation.

Development activity shows consistent maintenance of the codebase with regular updates to support modern build systems and documentation generation. The project maintains multiple documentation channels including generated HTML and PDF references, Markdown sources in the repository, and a GitHub Wiki, indicating ongoing effort to keep guidance current. Certified release packages are published through both the official Open CASCADE release portal and GitHub Releases, demonstrating a structured approach to version management and distribution.