Open-source alternatives to Power Fx

Expr is a high-performance expression evaluation engine and language for Go applications. It functions as a dynamic rule engine that parses and executes custom logic and data validations at runtime without requiring the application to be recompiled. The system utilizes a sandboxed logic executor to run expressions without side effects. It ensures program termination by employing instruction-level loop detection to prevent infinite loops and isolates the evaluation process from the host system. The engine employs a bytecode-based virtual machine and abstract syntax tree analysis to achieve ex

Scriban is a .NET text templating engine and embedded scripting language used for dynamic text generation. It functions as an abstract syntax tree manipulation tool and a template parser, allowing for the conversion of scripts into visitable trees for analysis, modification, and rendering. The engine is specifically designed for Native AOT compatibility, utilizing a reflection-free API to execute templates in trimmed environments. It also provides a dedicated parser and conversion system for Liquid templates, enabling the migration and execution of Liquid scripts within .NET. The project cov

Expr is a statically typed expression engine and domain-specific language for parsing and evaluating dynamic logic strings within Go applications. It functions as a bytecode expression evaluator that executes compiled logic with guaranteed termination and memory safety. The engine utilizes a specialized compiler and virtual machine to achieve high-performance execution. It employs static type validation during the compilation phase to ensure operand compatibility and prevent runtime crashes. The project provides a data transformation engine capable of mapping, filtering, and aggregating coll

This project is a reference implementation of Domain-Driven Design, Clean Architecture, and Command Query Responsibility Segregation (CQRS) patterns using the Go programming language. It serves as a sample application to demonstrate how to decouple core domain rules from infrastructure and delivery mechanisms. The system is built as a gRPC microservices architecture, utilizing type-safe communication and service contracts. It implements an event-driven architecture to manage eventual consistency and asynchronous processing, specifically employing the Outbox pattern to ensure reliable messagin

actionlint is a static analysis tool and linter specifically designed for GitHub Actions workflow files. It functions as a CI workflow validator and YAML configuration linter to ensure the syntax and logic of automation files are correct before deployment. The project distinguishes itself by performing deep security auditing and script analysis. It includes a shell script auditor to detect syntax bugs and script injection vulnerabilities in inline commands, and it scans for hardcoded credentials to prevent security leaks. The tool covers a broad range of validation capabilities, including ex

eShopOnWeb is a reference application for ASP.NET Core that demonstrates a sample e-commerce site. It serves as a template for building scalable services using domain-driven design to separate business logic from infrastructure and data access. The project implements a decoupled messaging pattern through a request pipeline to separate web controllers from application logic. It utilizes a repository pattern to abstract data persistence and isolate the core application logic from the specific database storage mechanism. The application covers a broad surface of web capabilities, including user

This project is a rule-based decision system that decouples complex business logic from application code by representing rules as portable, structured data. It functions as a business logic engine that evaluates nested boolean conditions to determine application outcomes based on dynamic inputs. The engine distinguishes itself by supporting the asynchronous resolution of external data, allowing it to fetch and inject real-time facts into the evaluation process at runtime. It utilizes a recursive evaluation model to process hierarchical rule sets and triggers event-driven actions immediately u

pycparser is a C99 parser library that converts C source code into an abstract syntax tree consisting of Python objects. It functions as an abstract syntax tree generator, transforming preprocessed C code into a structured hierarchy for programmatic analysis and transformation. The library integrates with a C preprocessor to handle directives before parsing. It also features a stub header parser, which uses minimal mock headers to allow the parsing of C code without requiring a full system C library installation. The project provides tools for static code analysis, C program analysis, and so

Oils is a Unix shell interpreter and scripting language runtime that combines a modern shell language with POSIX and Bash compatibility. It functions as a structured data shell, integrating JSON and J8 formats to manage complex data without relying on string parsing. The system is distinguished by a C++ transpiled interpreter that converts a subset of Python source code into strongly typed C++ for high-performance execution. It features a garbage-collected typed runtime that supports prototype-based polymorphism, lexical closures, and reference-based variable mutation. To decouple shell logic

This project is an ESLint plugin and static analysis tool designed to enforce best practices, prevent bugs, and maintain code quality in React projects. It functions as a specialized JSX linter that analyzes the syntax and structure of components to detect anti-patterns and API misuse. The plugin distinguishes itself by providing deep analysis of React-specific patterns, such as detecting state race conditions, preventing nested component definitions, and identifying unstable references that cause unnecessary re-renders. It also includes security hardening rules to identify vulnerabilities li

Rhai is an embedded scripting engine and dynamically typed language designed for integration into Rust applications. It functions as an abstract syntax tree compiler and native interop layer, allowing developers to map Rust types and functions into a scripting environment for bidirectional communication. The project serves as a framework for creating customizable domain-specific languages. It allows for the definition of custom operators, syntax, and restricted execution environments, enabling the creation of specialized languages with tailored functional sets. The engine covers a broad rang

PowerDNS is DNS server software used for serving authoritative and recursive DNS records. It functions as both an authoritative DNS server, providing definitive records for specific domains from trusted databases, and a recursive DNS resolver that finds answers for any domain by iteratively querying external servers. The project distinguishes itself through a backend-abstraction layer that decouples server logic from data storage, allowing records to be served from SQL databases, zone files, and external APIs. It includes a geo-aware DNS router to direct users to the nearest server based on t

The expression-language is a lightweight calculation component and parser tool that compiles and evaluates single-line string expressions against runtime variables. It functions as an expression engine that parses logical expressions into executable code or evaluates them directly against provided variables and functions to power dynamic rule evaluation and configuration. The engine features a complete architecture covering lexical tokenisation, intermediate code generation, and execution caching. It parses expression strings into hierarchical abstract syntax trees to enable programmatic insp

Poml is a prompt management framework and templating engine designed for authoring, versioning, and rendering structured prompts for large language models. It uses a semantic markup language to organize prompts into reusable templates, combining them with dynamic context and data to generate formatted inputs. The system distinguishes itself by decoupling core prompt logic from final presentation through a stylesheet-based approach. It provides a dedicated JSON schema output generator to enforce strict, machine-parsable model responses and a configuration interface for managing function tool s

RulesEngine is a business logic evaluator for .NET that executes complex rule workflows and dynamic expressions against input data. It functions as a dynamic expression evaluator and an externalized logic framework, allowing the definition and management of business rules in JSON format to change application behavior without recompiling code. The project decouples decision logic from source code by loading policies from external files or databases. It supports the registration of custom classes and methods to extend standard expression capabilities through type injection. The framework cover

Elsa Core is a workflow engine framework designed for defining, executing, and managing long-running business processes. It functions as a distributed workflow orchestrator and event-driven trigger system, capable of operating as a multi-tenant platform with secure data isolation. The project distinguishes itself through a flexible approach to workflow definitions, supporting a visual drag-and-drop designer, programmatic C# definitions, and portable JSON specifications. It provides a highly extensible architecture allowing for the development of custom activities and the use of a dynamic expr

depcheck is a project dependency auditor and npm dependency analyzer for the JavaScript ecosystem. It functions as an abstract syntax tree parser that scans source code to identify unused packages or missing declarations within a project manifest file. The tool distinguishes itself by parsing multiple language syntaxes and file formats to locate dependency imports. It can identify dependencies declared within tool-specific configuration files for build tools, linters, and test runners, and supports extensibility through custom detectors and parsers. The system provides capabilities for depen

govaluate is a Go expression evaluator and runtime logic parser. It functions as a dynamic rule engine that converts string-based expressions into executable operations, allowing for the calculation of mathematical and logical expressions at runtime. The library enables the execution of business rules and custom formulas without recompiling source code. It supports extending evaluation behavior through the injection of external parameters and the execution of user-defined custom functions. The system provides capabilities for dynamic data validation, including regular expression matching and

This project is a cross-platform development framework and application boilerplate designed to build mobile, desktop, and web applications from a single shared codebase. It functions as a React Native development tool, utilizing declarative components to render platform-specific user interfaces while maintaining consistent business logic across all supported environments. The framework distinguishes itself by centralizing core application rules and data management, ensuring identical functional results regardless of the target device. It employs a build-time file resolution system that allows

This project is a Lisp interpreter implementation guide and framework designed to teach the core principles of programming language design. It provides a structured, step-by-step technical framework for building a functional Lisp language from scratch, featuring a specialized interpreter engine and an S-expression parser that converts syntax into abstract syntax trees. The project emphasizes a code-as-data metaprogramming framework, enabling the implementation of macros, quoting, and quasiquoting to transform expressions during evaluation. It is designed with host language agnosticism, allowi

Dhall is a type-safe configuration language designed to create programmable configuration files that are guaranteed to terminate. It is a non-Turing-complete language that uses a strict type system to ensure correctness and prevent infinite loops during evaluation. The project functions as a deterministic configuration engine and marshalling tool, converting programmable expressions into static formats such as JSON, YAML, and Bash. It distinguishes itself through a focus on security and integrity, using semantic hashing to pin remote imports and enforcing origin policies to prevent data exfil

This project provides a structured boilerplate for building Go web applications based on clean architecture principles. It serves as a template for organizing codebases to ensure that core business logic remains isolated from external frameworks, database layers, and delivery mechanisms. The implementation prioritizes domain-driven design by centering the application around pure business entities that contain no references to infrastructure concerns. It utilizes layered dependency inversion and interface-based port adaptation to decouple the internal logic from external dependencies, allowing

Aviatorscript is a high-performance scripting language and expression evaluation engine designed for integration within Java applications. It enables the dynamic execution of mathematical and logical formulas by compiling script instructions directly into Java bytecode at runtime. The engine distinguishes itself by transforming dynamic logic into machine-readable instructions, allowing for near-native execution speeds. It includes a built-in caching mechanism that stores compiled bytecode to eliminate redundant parsing and compilation overhead during repeated formula execution. This library

This project is an open-source Flutter GitHub client and cross-platform mobile application. It serves as a GitHub GraphQL client and OAuth mobile app, providing a mobile interface for browsing repositories, issues, and user profiles. It is also designed as an open-source architecture reference to demonstrate Flutter best practices, state management, and multi-language localization. The application distinguishes itself by using GraphQL queries to retrieve nested repository and user information, reducing network requests and over-fetching. It utilizes a shared Dart codebase to provide a consist

HCL is a configuration language implementation designed for parsing, evaluating, and encoding structured settings through the use of blocks and attributes. It functions as a configuration AST parser and a schema-based decoder that maps attributes and blocks to internal data structures using predefined rules. The project includes an expression evaluation engine that resolves dynamic values and cross-references through multi-phase processing of variables and functions. It also provides a configuration file formatter to standardize the layout and indentation of source code for consistent visual

python-docx-template is a template engine for generating Microsoft Word documents by merging .docx files with data contexts using a logic-based markup syntax. It functions as a document automator that injects variables, images, and sub-documents into Word files while maintaining the original styling. The project uses a rendering system based on Jinja2 to apply template logic and filters to Office Open XML files. It allows for the creation of custom template filters to transform data during the rendering phase and includes a command line interface for producing documents by passing a template

php-xdg-base-dir is a PHP library and system path resolver designed to identify standard filesystem locations for application configuration, cache, and runtime files. It provides an implementation of the XDG Base Directory specification to organize user-specific data and configuration across different platforms. The library resolves directory paths by mapping standard categories to filesystem locations based on Freedesktop.org standards. It manages cross-platform file organization by detecting the operating system and applying corresponding default paths. The resolution process utilizes a pr