Update prior art.

Author: cfis

docs/index.md

@@ -7,7 +7,7 @@ Wrapping C and C++ libraries by hand is a long, arduous task. For large, complex
 As an example, there used to be hand-crafted Ruby [bindings](https://github.com/ruby-opencv/ruby-opencv) for [OpenCV](https://opencv.org/). However, they were based on the C API which was subsequently remove by the OpenCV project. `ruby-bindgen` was used to create new [bindings](https://github.com/cfis/opencv-ruby) based on the new C++ API. The bindings wrap over [1,000](https://cfis.github.io/opencv-ruby/) C++ classes and almost [10,000](https://cfis.github.io/opencv-ruby/) method calls. Imagine having to do that by hand!
 
 ## Ecosystem
-`ruby-bindgen` is one part of the C/C++ to Ruby toolchain.
+`ruby-bindgen` is part of the C/C++ to Ruby toolchain.
 
 ```mermaid
 flowchart TD

docs/prior_art.md

@@ -2,42 +2,46 @@
 
 This page lists related projects and adjacent tools that influenced, overlap with, or can complement `ruby-bindgen`.
 
-## Related Ruby Binding Generators
+## C/C++
 
-### ffi_gen
+### SWIG
 
-- Project: https://github.com/ffi/ffi_gen
-- Scope: Generate Ruby FFI wrappers for C APIs
-- Notes: Historical reference point for C-oriented generation in the Ruby ecosystem.
+- Project: [SWIG](https://www.swig.org/)
+- Scope: Multi-language binding generator for C and C++
+- Notes: Generates bindings for many languages including Ruby, Python, Java, and Go. Uses its own interface definition files rather than parsing headers directly. The most established tool in this space — active since 1996.
 
-### rbind
+## C
 
-- Project: https://github.com/D-Alex/rbind
-- Scope: C++ binding generator with a custom parser approach
-- Notes: Relevant comparison for C++ wrapping goals and parser tradeoffs.
+### ffi_gen
 
-## Adjacent Ecosystem Tools
+- Project: [ffi_gen](https://github.com/ffi/ffi_gen)
+- Scope: Generate Ruby FFI wrappers for C APIs
+- Notes: Has not been updated in over a decade and includes liblang findings versus using [ffi-clang](https://github.com/ioquatix/ffi-clang).
 
-### Rice
+## C++
 
-- Project: https://github.com/ruby-rice/rice
-- Scope: C++ library for implementing Ruby native extensions
-- Relationship to `ruby-bindgen`: `ruby-bindgen` can generate Rice-oriented C++ wrapper code.
+### rbind
 
-### ffi-clang
+- Project: [rbind](https://github.com/D-Alex/rbind)
+- Scope: C++ binding generator with a custom parser approach
+- Notes: Has not been updated in four years and is coupled to OpenCV
 
-- Project: https://github.com/ioquatix/ffi-clang
-- Scope: Ruby FFI bindings to libclang
-- Relationship to `ruby-bindgen`: provides AST access used for parsing headers.
+## Rust
 
 ### Magnus
 
-- Project: https://github.com/matsadler/magnus
+- Project: [magnus](https://github.com/matsadler/magnus)
 - Scope: Rust crate for Ruby bindings
 - Notes: Not a direct Ruby generator alternative for C/C++, but useful as a design reference for Ruby-native APIs from another language.
 
-## Positioning Summary
+### rb-sys
+
+- Project: [rb-sys](https://github.com/oxidize-rb/rb-sys)
+- Scope: Rust bindings for the Ruby C API
+- Notes: Provides low-level Rust bindings to Ruby, auto-generated from `ruby.h` using rust-bindgen.
 
-- `ruby-bindgen` focuses on generation from C/C++ headers with multiple output formats (`Rice`, `FFI`, `CMake`).
-- Compared with older generator projects, it emphasizes modern C++ edge cases and large-library workflows.
-- In practice, tools in this list can be alternatives for some use cases, or dependencies/complements in a broader pipeline.
+### Rutie
+
+- Project: [rutie](https://github.com/danielpclark/rutie)
+- Scope: Rust crate for Ruby bindings
+- Notes: An alternative to Magnus for writing Ruby extensions in Rust.