FSharp.Formatting is a mature, production-grade documentation generation toolchain for the F# ecosystem. It consists of several libraries (Markdown parsing, code syntax highlighting with F# Compiler Service integration, API documentation generation from XML doc comments, literate programming support for .fsx and .ipynb files) and a CLI tool (`fsdocs`) that builds static documentation websites with search, theme toggling, and a live-reload dev server. The system is primarily a developer tool used by F# projects to produce API reference sites and literate documentation. Its architecture is modular: the Markdown parser, code formatter, literate processor, and template engine are separate libraries that can be used independently. The CLI orchestrates these libraries, cracking MSBuild projects for metadata, evaluating code via F# Interactive, and generating output in HTML, LaTeX, Markdown, and Jupyter notebook formats. External dependencies include the F# Compiler Service, Newtonsoft.Json, and a bundled version of Yaaf.FSharp.Scripting. The codebase demonstrates deep integration with the F# compiler's type-checking and symbol resolution APIs, but also shows signs of organic growth: duplicated test data, a legacy C# MarkdownSharp project, and some conditionally compiled code for .NET Framework compatibility.
H5 is a C# to JavaScript/TypeScript transpiler that enables C# developers to target web platforms. The system consists of a compiler service (h5-compiler dotnet tool), a translator core that converts C# AST to JavaScript/TypeScript using visitor patterns and attribute-driven rules, and runtime libraries providing .NET-like functionality in JavaScript. Key features include SDK-style project integration, extensive globalization support through locale definitions, and support for JavaScript interop via attributes like [H5.External] and [H5.Template]. The toolchain processes C# source files through lexical analysis (using NRefactory), semantic analysis, translation to target language syntax, and emits JavaScript/TypeScript output with optional source maps and HTML wrappers.