Open-source alternatives to Gdsdecomp

Filepizza is a web-based peer-to-peer file sharing application that enables direct browser-to-browser data exchange. It utilizes WebRTC to establish connections between devices, allowing files to be sent without uploading data to a central server. The project provides a password-protected file sharing mechanism that secures transmissions via symmetric-key stream encryption. It includes a containerized signaling server that can be self-hosted to coordinate connections between peers and facilitate NAT traversal across restrictive networks and firewalls. The application supports multi-file tran

This project provides a server-side language runtime and a standardized Docker image for deploying applications across different operating systems. It functions as an execution environment for generating dynamic HTML, JSON, and XML content, while also serving as a command line interface for automation scripts and background jobs. The runtime is designed for extensibility through a C-based extension architecture, allowing the loading of custom modules for specialized functionality. It supports multiple server application interfaces, including a FastCGI web interface for high-performance commun

Rocky is an open-source enterprise operating system designed for server and cloud infrastructure. It is a community-maintained Linux server distribution that provides a platform focused on stability and security. The project is fundamentally a Red Hat Enterprise Linux compatible operating system, maintaining bug-for-bug binary compatibility to ensure identical software behavior. This allows it to serve as an enterprise-grade platform without proprietary licensing. The distribution covers a broad range of system administration capabilities, including package management via modular repository

dnSpy is a specialized suite of tools for the reverse engineering of .NET assemblies, functioning as a decompiler, assembly editor, and debugger. It translates compiled intermediate language back into high-level source code and provides an execution environment for stepping through compiled binaries to inspect runtime state without the original source files. The project includes a BAML decompiler that converts binary application markup language into a disassembled format and translates it into extensible markup language for user interface analysis. It also functions as a binary analysis tool

This project is a desktop application designed for the reverse engineering and inspection of compiled Java code. It functions as a graphical interface that translates Java bytecode back into readable source code, allowing users to examine the internal logic of class files and archives when original source files are unavailable. The tool provides a structured environment for navigating complex file hierarchies, including nested archives like JAR and WAR files. By maintaining an in-memory representation of loaded classes, it enables rapid searching and cross-referencing of code elements. The ap

XenonRecomp is a static binary translator and Xbox 360 game recompiler. It functions as a binary analysis tool and native code generator that converts machine instructions from Xbox 360 game executables into C++ source code for recompilation on different hardware platforms. The tool features specialized capabilities for translating compiled binaries, including the conversion of assembly jump tables into native switch cases and the detection of function boundaries using stack space data and branch link instructions. It optimizes translated code by converting non-volatile and non-argument regis

Fernflower is a Java bytecode decompiler designed to convert compiled Java class files back into human-readable source code. It functions as a bytecode analysis tool that recovers original program logic and structure from compiled binaries. The project includes capabilities for obfuscated identifier resolution to rename ambiguous member elements, ensuring clear identifiers in the resulting source. These features support the analysis of obfuscated code, legacy code recovery, and Java malware analysis for security auditing. The system utilizes a structural analysis pipeline that includes contr

Vyper is a security-focused, typed programming language and compiler designed for creating smart contracts that execute on the Ethereum Virtual Machine. It utilizes a Pythonic syntax to define contract logic and state, serving as a target for formal verification to allow for machine-checked proofs of correctness. The language distinguishes itself through strict architectural constraints that prioritize predictability and security. It enforces acyclic call graphs by prohibiting recursion and mandates bounded loops to ensure static gas prediction. Additionally, it features a native fixed-point

Arthas is a Java diagnostic tool and runtime debugger designed for real-time troubleshooting of applications. It functions as a remote diagnostics agent that allows users to inspect the runtime state of a Java process, including its heap objects and classloader hierarchies, without requiring a process restart. The project distinguishes itself through advanced bytecode manipulation capabilities, enabling live class hotswapping and the modification of bytecode in running processes. It supports in-memory source compilation and runtime bytecode decompilation to verify and update logic instantly w

pycdc is a reverse engineering toolset that decompiles and disassembles compiled Python bytecode files back into readable source code. It parses .pyc file headers, reconstructs abstract syntax trees from bytecode instructions, and handles version-specific opcodes across Python versions 1.0 through 3.13 with endian-aware binary parsing. The tool recovers numeric constants, string literals, and marshalled Python objects from compiled bytecode, supporting both file-based and in-memory bytecode loading. It provides a human-readable disassembly listing of bytecode instructions alongside full sourc

JPEX Software is a comprehensive reverse engineering suite for SWF binary files, serving as an ActionScript decompiler and editor. It provides a toolkit for decompiling, analyzing, and modifying the internal structure of compiled Flash content, including the extraction of scripts and media assets. The project is distinguished by its ability to perform direct binary modification, allowing users to edit bytecode and replace embedded resources without reverting to high-level source code. It includes a runtime ActionScript bytecode debugger for variable inspection and call stack analysis, as well

Fernflower is a Java bytecode decompiler and reverse engineering tool. It transforms compiled Java class files back into human-readable Java source code to reconstruct original program logic and variable names. The tool functions as a command line bytecode processor capable of batch processing Java archives and class files. It specifically handles obfuscated code analysis by renaming ambiguous identifiers and resolving naming conflicts to make the resulting source code easier to follow. The system employs static analysis to convert bytecode to source, utilizing debug information extraction t

Frege is a purely functional programming language that compiles to JVM bytecode, providing Haskell-like semantics for the Java platform. It is built around a Haskell-inspired compiler that implements non-strict evaluation and a static type inference system to ensure data immutability and prevent side effects. The project distinguishes itself through a sophisticated type system featuring rank polymorphism, type-class based dispatch, and static purity enforcement. It includes a JVM language bridge and a foreign function interface that map Java classes and interfaces into functional types, allow

Janino is a lightweight Java compiler and scripting engine designed to transform source code into executable bytecode directly within the application heap. It functions as a runtime compiler and class loading library, enabling the dynamic definition and execution of Java classes, methods, and expressions without requiring a full application restart. The project distinguishes itself through its ability to perform in-memory compilation and recursive descent parsing, which allows for the resolution of complex dependencies and circular references during the translation process. It provides a fram

This project is a Java bytecode reverse engineering suite that functions as a disassembler, decompiler, and editor for Java class files and Android APK binaries. It provides tools to transform compiled bytecode into assembly instructions or readable source code. The toolset supports Android APK analysis and Java binary patching, allowing for the modification of source code or bytecode and subsequent recompilation into functional binaries. It includes capabilities for removing Java obfuscation and performing malware analysis through the detection of malicious code patterns. The system incorpo

CircuitPython is a specialized derivative of the MicroPython runtime designed as an embedded Python interpreter for microcontrollers. It provides a high-level language environment that allows for direct hardware access through a dedicated hardware abstraction layer and a Python microcontroller runtime. The project is distinguished by firmware that exposes the microcontroller as a native USB mass storage device. This allows users to edit code directly on the device as if it were a removable drive, eliminating the need for specialized flashing tools and enabling filesystem-triggered code reload

Retdec is an LLVM-based machine code decompiler and static binary analysis tool designed for binary reverse engineering. It translates binary executable code into high-level representations to facilitate the reconstruction of program logic from compiled machine code. The system utilizes a retargetable frontend architecture and a multi-stage lifting pipeline to convert raw bytes into a common intermediate language. It differentiates custom program logic from known library code through signature-based identification and provides utilities for binary symbol demangling to restore human-readable n

Miller is a command-line data processor used for filtering, transforming, and aggregating name-indexed tabular data. It functions as a tool for querying and reshaping records across multiple file formats, serving as a converter between CSV, JSON, and YAML. The tool distinguishes itself by using a name-indexed data model, allowing users to manipulate fields by name rather than numeric position. It utilizes single-pass streaming algorithms to compute statistics and summaries on large datasets that exceed available system memory. Its capabilities cover data transformation and analysis, includin

Clojure is a general-purpose, functional programming language hosted on the Java Virtual Machine. It is a homoiconic S-expression language that represents programs as nested data structures, allowing code to be manipulated and evaluated as data. The project provides a framework for JVM interoperability, enabling the invocation of Java methods and integration with other JVM-based languages. It distinguishes itself through a persistent data structure library that uses bitmapped vector tries to manage immutable collections and a programmatic REPL for interactive software development and real-tim

This project is a toolkit for reverse engineering, modifying, and re-signing Android application packages. It provides a suite of utilities designed to decompile compiled binary files into readable source code and translate low-level bytecode into formats suitable for human analysis. The tool facilitates security auditing and research by allowing users to extract and interpret manifest metadata, decode Unicode sequences, and inspect internal application logic. Beyond analysis, it supports the modification of application packages, enabling users to rebuild and re-align files to optimize perfor

QLExpress is a dynamic scripting engine and expression language for the Java platform. It functions as a runtime expression evaluator and business rule engine, allowing applications to execute scripts and evaluate business logic without requiring system recompilation. The engine distinguishes itself through a secure scripting sandbox that enforces security policies via class whitelisting and execution timeouts. It supports high-precision mathematics to prevent rounding errors and provides language alias support to create domain-specific languages that resemble natural language. Additional cap

This project is a comprehensive Android reverse engineering suite that functions as a decompiler, bytecode deobfuscator, and malware analysis tool. It is designed to convert APK, DEX, and OAT binaries into human-readable source code using a native implementation that does not require a Java Virtual Machine. The platform is distinguished by its integration with Frida for dynamic analysis, allowing users to hook methods, inject custom JavaScript, and dump device memory in real time. It also features specialized security engines, including a taint propagation engine and a stack-state machine, to

Recaf is a suite of specialized tools for assembling, editing, deobfuscating, decompiling, and instrumenting Java bytecode and runtime processes. It provides a coordinated environment for modifying compiled Java class files and analyzing the behavior of Java applications. The project distinguishes itself through a multi-level abstraction layer that allows for editing across different formats and a pluggable framework that routes bytecode through multiple configurable decompilation engines. It includes an embedded scripting engine and plugin architecture to automate repetitive tasks and extend

Maven is a Java build automation tool and software build orchestrator. It functions as a project lifecycle manager and dependency management system, using a standardized project object model to compile, test, and package Java projects. The project distinguishes itself through a phase-based build lifecycle and a plugin-based extension model, allowing users to bind custom goals to specific build stages. It coordinates complex software through multi-module project orchestration and ensures a reproducible build workflow by neutralizing environmental variables and controlling toolchain versions.

Hy is a Lisp implementation for Python that allows for writing Lisp syntax which compiles to Python bytecode. It operates as a Python-based Lisp dialect and S-expression language, providing full access to the Python standard library and ecosystem. The language focuses on macro-based metaprogramming, featuring an AST-walking macro system and reader macros that allow for custom syntax transformations and parsing rules. It enables the manipulation of the abstract syntax tree to extend language capabilities. The project includes a read-eval-print loop for interactive development and supports sta

This project is an educational implementation of a relational database engine written in C. It functions as a SQLite clone, demonstrating the internal mechanics of a database system through a C-based systems project that focuses on manual memory management and file I/O. The engine is distinguished by its use of a bytecode virtual machine, which executes database operations by compiling SQL statements into low-level instructions. It utilizes a B-tree database engine to organize records in a balanced tree structure, ensuring efficient insertion, search, and range scanning. The system covers co

Brython is a Python 3 runtime and interpreter that executes scripts directly in the web browser. It serves as a client-side environment that translates Python source code into executable JavaScript to handle frontend logic without requiring server round-trips. The project provides a bidirectional interoperability bridge between Python and JavaScript, allowing for the integration of external JavaScript libraries. It further functions as a tool for packaging Python scripts into standalone native mobile applications for Android devices. The runtime includes a library for programmatic manipulati