REPENTOGON is a comprehensive modding framework for the game The Binding of Isaac: Repentance. It extends the game's Lua API with hundreds of new functions, provides low-level hooking and assembly patching capabilities, integrates ImGui for developer tools, and adds features like custom item pools, save syncing, virtual room management, and achievement tracking. The architecture is a hybrid of a C++ DLL that injects into the game process and a set of Lua scripts that run in the game's Lua environment. Key entry points include the DLL main (dllmain.cpp) which initializes hooks and patches, and the Lua registration system (LuaInit.cpp) which exposes new classes and callbacks. The framework relies on reverse-engineered game structures, signature scanning, and runtime code modification to achieve deep integration. External dependencies include the game itself, Lua 5.4, ImGui, and several bundled libraries (glad, rapidxml, rapidjson, mINI). The codebase is large and actively maintained, with a strong focus on modder extensibility and bug fixing.
UAssetGUI is a Windows Forms desktop application for low-level examination and modification of Unreal Engine game assets. It allows users to open, edit, and save .uasset, .umap, .pak, and .utoc files, with JSON export/import, C# scripting via embedded Roslyn, property mappings for unversioned assets, and full theming and localization. The architecture is a monolithic GUI built on .NET 10 preview, relying on the UAssetAPI submodule for serialization. Key entry points are Program.Main and Form1 (the main editor window). The application targets modders and researchers who need to inspect or alter binary asset data directly. It includes custom controls, a plugin-like script system using collectible assembly load contexts, and supports container file extraction/repacking via native binaries. The codebase is well-structured for its niche but tightly coupled to Windows Forms and the UAssetAPI ecosystem.
Rusted PackFile Manager (RPFM) is a desktop application for modding Total War games. It provides comprehensive tools for opening, editing, and saving proprietary game pack files (.pack) and dozens of embedded binary formats (animations, models, sound banks, battle maps, UI layouts, etc.) across all major Total War titles from Empire to Warhammer 3. The application is built in Rust with a Qt6 frontend, using a client-server architecture where the UI delegates heavy file operations to a background server over WebSocket. It also exposes a headless server with WebSocket and MCP endpoints for AI tool integration. The codebase is modular, with separate crates for core library (`rpfm_lib`), extended features (`rpfm_extensions`), IPC protocol (`rpfm_ipc`), telemetry (`rpfm_telemetry`), and shared UI utilities (`rpfm_ui_common`). It includes custom C++ Qt widgets, a plugin scripting system (Lua/Python), and self-update capabilities.