CosmosOS/Cosmos

Cosmos is an operating system "construction kit". Build your own OS using managed languages such as C#, VB.NET, and more!

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CosmosOS/Cosmos has 3k+ stars and 550+ forks on GitHub, is written in C#, and was last pushed on Oct 12, 2026. Data as of . Signed-in members get hourly updates — create a free account.

Summary Information

Updated 3 minutes ago
Added to GitGenius on September 21st, 2026
Created on December 4th, 2014
Open Issues & Pull Requests: 34 (+0)
GitHub issues: Enabled
Number of forks: 591
Total Stargazers: 3,225 (+0)
Total Subscribers: 166 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 2.6 hours
Mean response time: 184.1 days
90th percentile: 726.7 days
Tracked items: 227

Maintainer activity

4 people did triage or write work on this repository in the last 12 months.

Counts unlabeled, assigned, unassigned, milestoned, demilestoned, locked, unlocked over the last 12 months. These are issue and pull request events that require triage or write permission. Commits and code review are not counted. labeled and renamed are excluded because GitHub issue forms record the issue author as the actor. Figures from October 18, 2026. This count is not comparable across projects: each project's automation decides which of these events a person emits. How this is counted.

How this project is maintained

Roughly one issue in four opened in the past year never receives a reply. 38% of open issues come from outside the core team, a mix of external reports and the maintainers' own roadmap. Work labelled "Area: Build" is answered fastest, typically in under an hour, while "Priority: Low" waits about 5 months. Only 54% of issues opened in the past year have been closed. Three people close 72% of everything that gets resolved.

Charts & Analytics

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Issue Activity (beta)

Open issues: 28
New in 7 days: 6
Closed in 7 days: 4
Avg open age: 2 days
Stale 30+ days: 0
Stale 90+ days: 0

Recent activity

Opened in 7 days: 3
Closed in 7 days: 0
Comments in 7 days: 0
Events in 7 days: 5

Top labels

  • Bug (88)
  • Gen2 (68)
  • Up for Grabs (51)
  • Area: Visual Studio Integration (37)
  • Area: Build (35)
  • Priority: Low (28)
  • Complexity: Low (20)
  • Priority: Medium (20)

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Detailed Description

Cosmos is an operating system construction kit that enables developers to build custom operating systems using managed languages like C# and VB.NET.

The project addresses the barrier to entry for OS development by allowing programmers to write kernel and system code in high-level managed languages rather than requiring low-level assembly or C expertise. It provides a framework that handles the translation from managed code to machine code and manages the compilation pipeline needed to produce bootable operating systems. This approach lets developers focus on OS design and functionality while the toolkit handles the underlying technical complexity of bare-metal programming.

Cosmos suits hobbyists, students, and researchers interested in operating system design without the steep learning curve of traditional OS development. It works well for educational projects, experimental OS concepts, and custom systems where the overhead of managed languages is acceptable. The project is appropriate for those who want to understand OS internals while leveraging familiar .NET languages and tooling rather than learning assembly language or C.

Development activity shows consistent engagement with the codebase. The project maintains regular updates to its core functionality and build infrastructure. Community contributions are actively integrated, indicating an open approach to external participation. The maintainers respond to issues and pull requests, suggesting ongoing stewardship of the project's direction and quality standards.