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SecureStore
A .NET implementation of the cross-platform SecureStore (symmetrically-encrypted secrets) protocol
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infisical
♾ Infisical is the open-source secret management platform: Sync secrets across your team/infrastructure and prevent secret leaks.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Have you looked into NeoSmart's SecureStore? It uses a versionable json file with encrypted strings as secrets, and can be unlocked via a password or a keyfile that you deploy to your application. I've used it before, and it's pretty easy to use and implement. https://github.com/neosmart/SecureStore
Similar to https://infisical.com too (but Infisical is open source and end-to-end encrypted)
A secrets manager for .env and .env.vault files. Sync your secrets across teams, machines, and environments.