C#

Modern multi-paradigm language on .NET. Strong Windows heritage; first-class on Linux via .NET.

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MIT · https://learn.microsoft.com/dotnet/csharp/

Programming languages

C# / .NET runtime

Hosting: Self-hosted

Open-source .NET; Azure is optional, not required.

Fair 4.0 Easy 3.7 Secure 3.3

Pillar	Criterion	Score	Evidence
Easy	Day-one UX Can non-technical staff use it without a project?	3	Typical onboarding for this product category. Source
Easy	Operate Admin burden, updates, backups and language coverage.	3	You handle updates, backups and scaling. Source
Easy	Integrate SSO, mail/CalDAV, APIs and common NGO connectors.	5	Integrations vary; check current APIs and connectors. Source
Fair	Lock-in / exit Can you leave with your data in open formats, at known cost?	4	Self-host keeps data and exit paths under your control. Source
Fair	Sovereignty EU legal entity, EU hosting, and exposure to extra-EU lawful access?	3	Non-EU or special jurisdiction — verify hosting and lawful-access exposure. Source
Fair	Openness Open source or open standards? Are independent implementations possible?	5	Open-source licence or self-host path available. Source
Secure	IT security Authentication, encryption, patch cadence and independent audit.	4	Security baseline depends on vendor posture and your configuration. Source
Secure	User security 2FA, roles, phishing resistance and safe defaults.	3	Account roles and MFA availability vary by plan. Source
Secure	Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture.	3	Review DPA, residency and subprocessors carefully. Source