CodExt is a Python library and command-line tool that extends the standard library's codecs with over 120 custom encodings for data transformation. It provides encoding/decoding functionalities across domains including base encodings (baseN, base45, base85, etc.), cryptography (Vigenère, RSA, XOR), compression (gzip, LZ77/LZ78), steganography, and language-based transformations (Leetspeak, Morse, Braille). The system features a heuristic-based guess mode for automated multi-layered decoding and a macro system for chaining codecs. Architected as a plugin-based library, it allows dynamic registration of new codecs and is designed for CTF, security, and data obfuscation tasks. The codebase demonstrates strong modularity with clear separation of concerns between core functionality, codec implementations, and utility modules.
objc2 is a Rust library that provides safe, idiomatic bindings to Apple's Objective-C runtime and a vast portion of its system frameworks (Foundation, AppKit, Metal, CoreFoundation, and hundreds more). The core crate wraps the Objective-C runtime with type-safe message sending, class definition, reference counting via Retained<T>, and protocol support. Around it, the workspace includes supporting crates for Objective-C blocks (block2), Grand Central Dispatch (dispatch2), a header translator that auto-generates Rust code from Apple's SDK headers, and a documentation parser (apple-doc). The architecture is a large Rust workspace (hundreds of crates) with a clear separation: a lightweight runtime layer (objc2-encode, objc2-exception-helper, objc2-proc-macros), the main objc2 crate with macros and runtime types, and generated framework crates that follow a uniform pattern (extern_class!, extern_methods!, etc.). The project places heavy emphasis on safety and correctness, employing compile-time encoding verification, fuzz testing, assembly-level baseline tests for optimized message sending, and UI tests to catch type errors at compile time. Despite its complexity, the code exhibits strong craftsmanship: the macro infrastructure is well-organized, memory management is carefully designed (two-phase initialization, drop flags, Writeback helpers), and performance-critical paths use inline assembly for retain/autorelease optimization. The project is actively maintained with a modern toolchain, CI against multiple runtimes (Apple, GNUstep, ObjFW), and thorough documentation. It stands as the most comprehensive Rust-to-Objective-C bridge available, suitable for building native macOS/iOS applications entirely in Rust.