Open-source alternatives to Cel Go

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

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

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

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

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

Goja is a JavaScript engine and ECMAScript compliant interpreter implemented entirely in Go. It serves as an embedded scripting engine that allows Go applications to execute JavaScript code and integrate a programmable scripting layer without relying on Cgo or external native dependencies. The project functions as a bridge between Go and JavaScript, enabling bidirectional data exchange and function invocation. It allows Go hosts to expose native structs, slices, and maps as JavaScript objects and arrays, while providing mechanisms to export script values and functions back into native Go type

Power-Fx is a declarative logic framework and low-code formula language based on Excel formulas. It functions as an expression parser and evaluator that transforms formula strings into an abstract syntax tree to execute logical operations and resolve values. The project provides a standardized integration layer to connect formula-based logic to external data sources for querying and pushing records. This allows for the definition of business rules and calculations that can be shared as consistent logic across different applications and platforms.

Unified is a syntax tree processing engine and content ecosystem designed to parse, transform, and serialize text content. It functions as a plugin-based content pipeline that converts raw text into structured abstract syntax trees using plain JavaScript objects for programmatic inspection and modification. The project distinguishes itself through a modular architecture that enables cross-ecosystem translation, allowing syntax trees to be converted between different specifications such as HTML and Markdown. It utilizes a system of immutable processor cloning and shared state containers, ensur

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

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

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

Ohm is a formal grammar parser generator and domain-specific language framework. It provides a system for defining custom languages to parse, validate, and extract data from input text, transforming raw strings into hierarchical abstract syntax trees based on specified formal rules. The project utilizes an Earley parsing algorithm, which allows it to support all context-free grammars, including those with left recursion and ambiguity, without requiring predefined operator precedence. It also includes a dedicated debugging toolkit for tracing and visualizing the step-by-step state transitions

Sorbet is a static analysis tool and type checker designed for Ruby codebases. It identifies type inconsistencies, potential bugs, and logic errors by examining source code without execution, helping to improve software reliability and maintainability in large-scale projects. The system employs a constraint-based type inference engine that evaluates expressions against defined annotations to validate data structures. To support rapid development, it utilizes incremental analysis and caching to provide feedback by processing only modified files and their dependencies. Beyond static analysis,

Pytype is a static code analysis tool and type inference engine for Python. It functions as a static type analyzer that detects type mismatches and verifies type annotations without requiring full manual hinting, while also serving as a type stub generator for producing standalone definition files. The project distinguishes itself by automatically determining variable and function types through an analysis of code patterns and assignments. This inference engine allows for structural code verification and the generation of type stubs that describe the interfaces of modules and functions. The

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

This project is a CSS stylesheet compiler that transforms Sass source code into standard CSS. It provides the primary mechanism for converting styles while implementing syntax rules for web browsers and applications. The compiler supports a module-based dependency system that uses dedicated namespaces to provide encapsulation and prevent global scope collisions. It includes specialized engines for multi-model color conversion and advanced mathematical calculations, including trigonometry and logarithms. Capabilities cover a broad range of build and analysis tools, including the generation of

This project is a POSIX shell toolset providing utilities for parsing, formatting, interpreting, and validating shell scripts. It includes a parser that converts Bash and Zsh source code into structured syntax trees, a formatter for standardizing script layout, and a runtime interpreter for executing shell commands and script logic. The toolset supports dialect-aware parsing to handle multiple shell language specifications. It provides capabilities for static analysis, allowing shell source code to be converted into structured data for external manipulation or validation against specific dial

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

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

Scriban is a text templating library and .NET scripting engine used for dynamic text generation. It functions as a template processor and a safe scripting sandbox, providing a secure execution environment that restricts object exposure to prevent unauthorized code execution. The project also includes an abstract syntax tree template parser that allows for programmatic template analysis and modification. The engine features a dedicated Liquid template engine and compatibility mode, allowing it to parse, execute, and convert templates written in Liquid syntax. It distinguishes itself through a

Expression evaluation in golang

A Lua VM in Go

PHP bindings for the Go programming language (Golang)

Tengo is a dynamic, embeddable scripting language for Go applications that allows for the execution of custom scripts without requiring the host binary to be recompiled. It operates as a bytecode-compiled virtual machine, transforming source code into a compact intermediate representation for execution on a stack-based engine. The system is designed as a secure scripting sandbox, enforcing strict limits on memory allocation and execution time to safely run untrusted code. It supports concurrent script execution by cloning compiled bytecode and using recursive immutability conversion to share

Starlark in Go: the Starlark configuration language, implemented in Go

Scriptable interpreter written in golang

Gopher-lua is a complete implementation of the Lua language and its standard libraries written natively in Go. It serves as an embedded scripting engine and virtual machine that allows Go applications to execute Lua scripts and exchange data between the host and the script environment. The project provides a bytecode compiler to transform source code into a binary format for faster execution. It enables deep integration between the two languages by allowing the registration of native Go functions to be called from scripts, and the invocation of script functions directly from Go. The engine c