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Disclaimer: Star Stack provides information about European technology services for educational purposes only. Service listings, sovereignty assessments, and recommendations do not constitute legal, financial, or professional advice. We encourage you to verify all information independently and consult appropriate professionals before making technology decisions. Star Stack is not affiliated with any listed services unless explicitly stated.

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Mono | Star Stack

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Mono

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Mono

Name: Mono
Author: Star Stack

Open-source .NET runtime for cross-platform C# development

Visit Website GitHub 11.5K

About

Mono is an open-source implementation of the .NET Framework that allows developers to run C# applications on Linux, macOS, and other non-Windows operating systems. It serves as the foundation for cross-platform .NET development, having pioneered support for mobile and desktop environments outside of Windows.

Resources

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Sovereignty Score

Recorded assessment version: jurisdiction-ownership-2026-10-04

out of 100

Data completeness64% (Partial)

Jurisdictional(56%)

Significant foreign legal exposure risk

Jurisdiction: United States (EU adequacy decision)
Parent provider in United States (CLOUD Act risk) (Microsoft Corporation)
Five Eyes intelligence alliance exposure
US CLOUD Act applies (US can compel data access regardless of storage location)

Ownership(44%)

Significant foreign ownership or control risk

Mixed ownership (>30% non-EU)
Bootstrapped stage
Acquisition risk unknown (assumed high) (Submit verified data to improve this score)

More dimensions coming soon

GovernanceComing soon

PortabilityComing soon

LicenseComing soon

CommunityComing soon

How missing data affects scores Submit data corrections

Provider

Xamarin Inc.

Quick Facts

Legal jurisdiction: United States
Headquarters: United States
Ownership: Mixed (>30% Non-EU)
Deployment: Self-host, SaaS

Evidence and freshness

Verification date unknown. This assessment needs review.

A score is an assessment of recorded facts. Missing evidence and unresolved ownership can affect the result.

hqCountry: github
Retrieved 30/01/2026, confidence 88%.
Read evidence excerpt
Mono open source ECMA CLI, C# and .NET implementation - originally developed by Ximian/Novell/Xamarin, now Microsoft
hqCountry: github
Retrieved 30/01/2026, confidence 88%.
Read evidence excerpt
Mono open source ECMA CLI, C# and .NET implementation - originally developed by Ximian/Novell/Xamarin, now Microsoft
Ownership: other
Statement 12/02/2026, confidence 90%.
Read evidence notes
From enrichment pipeline 2026-02-06_03-32-59_c6_v20-validation
Ownership: other
Statement 12/02/2026, confidence 90%.
Read evidence notes
From enrichment pipeline 2026-02-06_03-32-59_c6_v20-validation