Open-source alternatives to Vale

LanguageTool is a multilingual grammar and style checking engine designed to detect spelling, grammar, and writing errors across multiple languages. It provides automated proofreading capabilities that can be deployed as a self-hosted server or executed as a standalone local desktop application. The project distinguishes itself through a flexible rule development framework, allowing linguistic patterns to be defined via XML or implemented as custom Java classes. It utilizes n-gram frequency modeling for confused word detection and supports neural word embeddings to improve disambiguation betw

This is a Vim plugin that adds simultaneous multi-selection and parallel editing capabilities to the editor. It functions as a multi-cursor tool and regex-based batch editor, allowing users to perform the same editing action across multiple locations in a buffer at once. The extension enables the placement of virtual cursors across a document using regular expressions or by identifying all occurrences of a word. It also allows for the generation of cursors on every line within a visual selection to facilitate multi-line block editing. The tool supports synchronized character insertion and pa

Harper is a local English linter and grammar checker designed as an IDE writing assistant. It operates as a language server that provides real-time spelling and grammar analysis for markdown and code comments, processing all linguistic data on the local device to ensure privacy and eliminate cloud dependencies. The tool is specialized for technical documentation, featuring the ability to identify and ignore text within code fences and inline blocks to prevent false positives. It allows for personalized configuration through custom dictionaries and the use of suppression comments to exclude sp

Eloquent-JavaScript is a comprehensive JavaScript programming textbook and interactive coding tutorial designed for web development education. It serves as both a language reference and a practical guide, combining theoretical lessons with an environment where learners can execute and modify code examples. The project focuses on the fundamental principles of the JavaScript language, including lexical scoping, prototype-based inheritance, and asynchronous patterns. It provides detailed instruction on object-oriented programming, functional programming, and the use of the browser DOM to create

sqlean is a collection of SQLite extension libraries implemented as C-based shared libraries. It provides a suite of additional scalar and table-valued functions that expand the native capabilities of the SQLite database engine. The project provides specialized toolsets for cryptography, advanced mathematics, networking, and filesystem access. These include binary hashing and encoding, statistical analysis, IP address validation, and the ability to map CSV files or filesystem paths as virtual tables. The library also includes comprehensive text processing tools such as regular expressions, f

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

Spotless is a multi-language formatting orchestrator and Gradle plugin that automates code styling across various programming languages within a single build pipeline. It functions as a coordinator for multiple third-party formatters, a code style linting tool, and a system for inserting and updating standardized license headers. The project distinguishes itself through git-integrated style enforcement, using pre-push hooks and git references to apply formatting only to modified files or lines. It supports shared build configurations, allowing formatting rules to be distributed and loaded acr

This project is a software engineering playbook providing a collection of standardized guidelines and processes for managing the full software development lifecycle and team operations. It serves as a high-level framework for organizing agile project management, API design, containerized development standards, and markdown documentation workflows. The framework establishes a system for language-agnostic API design to automate client library generation and documentation. It also defines standards for providing uniform contributor environments and toolchains through virtualized containers. The

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

Stylelint is a static code analysis tool and linter for CSS and style-like languages. It identifies errors, enforces coding conventions, and operates as a PostCSS plugin to validate stylesheets during build pipelines. The project distinguishes itself through support for non-standard syntaxes, including preprocessor parsing for SCSS and Less, and the ability to extract and lint embedded styles from JavaScript, HTML, and template literals. It features an automated fixing system that programmatically corrects repairable styling violations to ensure consistency. The system provides a plugin arch

Melody is a regular expression transpiler and pattern compiler that translates a high-level, human-readable syntax into standard regular expressions. It functions as a tool to simplify the creation and maintainability of complex matching patterns. The project provides a specialized syntax for defining reusable variables and macros to reduce duplication within expressions. It includes native support for mapping specialized labels to Unicode category properties and automatically handles the escaping of literal text. The system is accessible through several interfaces, including a command-line

MarkEdit is a high-performance Markdown text editor and document navigator. It provides a scriptable editing environment that supports side-by-side HTML rendering for real-time formatting previews. The editor is distinguished by a multi-caret engine that enables rectangular block selections and simultaneous modification of multiple text ranges. It allows for extensive interface and functional customization through external CSS stylesheets and the integration of system-level scripts to automate repetitive tasks. The application includes tools for managing large documents, such as content bloc

This project is a web-based collaborative editor and scientific document management system designed for LaTeX. It provides a centralized environment for writing, editing, and compiling academic manuscripts, enabling multiple users to work on the same project simultaneously through real-time synchronization. The platform distinguishes itself by treating documents as version-controlled repositories, allowing for granular history tracking and bidirectional synchronization with external version control systems. It features a secure, containerized compilation pipeline that isolates build processes

ZLS is a language server for the Zig language that implements the Language Server Protocol to provide IDE-like intelligence. It functions as a code intelligence provider, static code analysis tool, and automated refactoring engine for Zig projects. The server integrates directly with the Zig compiler toolchain to derive precise type information and perform semantic analysis. It uses this integration to surface real-time compilation errors as editor diagnostics and to provide semantic syntax highlighting based on resolved types rather than regex patterns. The project covers a wide range of de

sd is a command line text manipulation utility designed for searching and replacing text patterns across multiple files. It functions as a regex-based find and replace tool that allows for in-place file editing directly from the terminal. The project supports both regular expression replacements, including the use of capture groups for complex transformations, and fixed string replacement for literal text substitutions. It specifically handles multi-line text replacement by processing file contents as single blocks to match patterns that span across newline characters. The tool provides capa

pycodestyle is a Python code quality utility that checks source files against the PEP 8 style guide, reporting deviations as a static analysis tool. Its primary function is to enforce consistent code formatting by scanning files and flagging violations with precise line and column numbers for direct integration into editors or workflows. The tool combines token-based pattern matching with abstract syntax tree (AST) context enrichment, enabling it to evaluate both surface-level formatting and deeper structural patterns. Its architecture supports custom validation rules through a plugin interfa

capa is a binary capability scanner that identifies high-level behaviors and actions an executable can perform, such as network communication or file manipulation. It functions as a malware behavior analysis tool and a MITRE ATT&CK mapping framework, scanning PE, ELF, .NET, and shellcode files through both static analysis and dynamic sandbox report processing. The tool distinguishes itself through a YAML-based detection rule engine that defines detection logic in human-readable files, with conditions expressed as feature combinations and logical operators. It integrates with IDA Pro, Ghidra,

Standard is a zero-configuration static analyzer, linter, and formatter for JavaScript. It functions as a style guide that enforces consistent coding rules and identifies programming errors without requiring manual configuration files. The tool distinguishes itself by providing an automatic code fixer that scans source files to correct style violations and ensure a uniform codebase. It implements a predefined rule set to eliminate the need for project-specific configuration. The project covers a broad range of static analysis capabilities, including support for experimental language syntax a

capa is a static analysis tool that scans executable files to identify what a program can do, detecting capabilities such as API calls, byte sequences, and structural patterns without executing the code. It supports multiple file formats including PE, ELF, .NET, and shellcode, and can also process runtime behavior traces from sandbox reports generated by CAPE, DRAKVUF, or VMRay. The tool integrates directly with reverse engineering environments through plugins for IDA Pro and Ghidra, allowing analysts to view capability matches and author detection rules within their disassembler of choice. C

CloudSaver is a multi-cloud file transfer manager and storage aggregator designed to discover remote resources and save them directly to cloud drives. It functions as a cloud file downloader and management platform that enables the movement of data between different cloud storage providers without requiring files to be downloaded to a local device first. The system uses OAuth authentication to manage secure connections to third-party cloud drives, facilitating direct server-to-server data transfers. It incorporates asynchronous streaming to move data between remote sources and destinations, p

Search-Replace-DB is a MySQL search and replace tool designed for updating database strings and migrating PHP-based websites and content management systems. It functions as a database migration utility to update references and table engines when moving sites to new servers or domains. The project specifically handles the updating of text inside serialized PHP arrays and objects, recalculating lengths to maintain data structure integrity and prevent corruption. It also includes a converter for modifying storage engines and character collations across multiple MySQL tables. Additional capabili

JSON5 is a parser and serializer for a human-readable configuration format that extends JSON. It serves as a JavaScript-based data parser that allows for a more flexible version of the JSON specification to simplify manual editing of data files. The project provides capabilities to support comments, trailing commas, and multi-line strings. It includes utilities to convert this extended syntax into standard JSON for compatibility with tools requiring strict specifications. The library covers data serialization, string parsing, and structural syntax validation. It also provides integration for

mtail is a log-based metrics extractor and time-series monitoring agent. It functions as a log pattern parser that transforms unstructured log text into structured numerical monitoring data without requiring modifications to the original source code. The tool operates as a push-based telemetry pipeline, aggregating extracted metrics in memory before transmitting them to remote monitoring endpoints and time-series databases. Its capabilities cover log data telemetry, application performance monitoring, and custom log monitoring through a pipeline that moves parsed data from text logs to exter

Black is a deterministic Python code formatter and style guide enforcer. It automatically reformats source code and Jupyter notebook cells into a consistent style to eliminate manual debates over code layout and reduce noise in version control diffs. The tool uses abstract syntax tree analysis to restructure code layout while ensuring that the underlying functional logic remains unchanged. It employs a deterministic engine that produces a single consistent output for any given input, removing subjective styling choices. The system provides capabilities for in-place file mutation, automated s

dprint is a multi-language code formatter that applies consistent styling across various programming languages using a pluggable architecture. It functions as a unified project style management tool, a command-line interface for continuous integration style enforcement, and a Language Server Protocol implementation for real-time formatting in editors. The project is distinguished by a WebAssembly-based plugin system that loads sandboxed formatting logic from URLs or file paths. It further extends its capabilities through a process-based tool integration that wraps external command-line interf

Apkleaks is a static analysis tool and security auditor designed to extract hardcoded secrets, API endpoints, and sensitive data from Android application packages. It operates as a secret scanner that analyzes compiled binaries without executing them to identify potential information leaks and insecure endpoints. The tool utilizes a regex-based data extraction engine to identify sensitive strings within decompiled code. It supports customization through JSON-defined search patterns and provides configuration flags to tune the behavior of the underlying disassembler. The analysis pipeline enc

ChatPaper is a suite of AI agents and utilities designed for academic literature automation, manuscript editing, and research assistance. The system functions as a research assistant that summarizes, translates, and analyzes scholarly papers, while providing specialized tools for converting academic PDFs into structured markdown to preserve formulas for analysis. The project features a literature survey automator that crawls research repositories and synthesizes domain reports, alongside a research mind map generator that transforms linear document content into non-linear node-based maps. It