Soy Soy.FireFly by: Soy .NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher. 27 total downloads last updated 8/19/2026 Latest version: 0.1.0-alpha.1 (prerelease) competitive-programming algorithms csharp sourceexpander library-checker C# 13 algorithms for competitive programming with SourceExpander support.