Project Summary
COSMOS (C# Open Source Managed Operating System)
Cosmos includes a compiler (IL2CPU, which is part of Cosmos) that reads the input file (usually the shell) and Cosmos libraries and compiles the resulting IL to x86 code. IL2CPU has a layer for cross platform and we plan to support other processors and platforms, including x64. IL2CPU also supports certain extension methods which allow C# code to interact directly with the CPU, registers, and ports in the kernel. IL2CPU contains some inline assembler, but there are no ASM files that need to be linked in.
Currently IL2CPU first outputs raw asm files (with IL comments) and then processes them through nasm (a free assembler). Later we plan to emit directly to binary.
In a Nutshell, Cosmos (C# Open Source Managed Operat...
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has a well established, mature codebase
maintained by a small development team
with decreasing Y-O-Y commits -
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took an estimated 26 years of effort (COCOMO model)
starting with its first commit in August, 2007
ending with its most recent commit 8 months ago
Quick Reference
BSD 3-clause "New" or "Revised" License
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Commercial Use
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Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryJun 14 2026 — Jul 14 2026
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12 Month SummaryJul 14 2025 — Jul 14 2026
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