Open-source alternatives to Lz String

This project provides a lossless compression algorithm and a byte-oriented compression library designed for high-speed data reduction and maximum decompression speed. It functions as a stream-oriented compression engine, a software library for encoding and decoding data blocks, and a command-line tool for managing interoperable compressed frames. The system distinguishes itself through the use of predefined pattern dictionaries to improve compression ratios for small data sets and small packets. It supports multiple processing modes, including high-speed block compression for minimal latency

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

Browser image compression is a JavaScript utility designed to reduce image file sizes directly within the web browser. By adjusting dimensions and quality settings locally, the library minimizes bandwidth usage and storage requirements before files are uploaded to a server. The library maintains interface responsiveness by offloading heavy image manipulation tasks to background worker threads. It manages large image files using memory-efficient binary objects and utilizes the browser canvas application programming interface to re-encode data into formats such as JPEG or WebP. Users can contr

7-Zip is a data compression tool and file archiver designed for creating and extracting archives. It functions as a utility for reducing the storage requirements of files and folders through high-ratio lossless compression and managing the 7z open-standard format. The software provides capabilities for cross-platform archive management, allowing users to open and create various archive formats across different operating systems. It supports data backup and recovery, as well as the packaging of multiple files into single archives for distribution. The project implements a variety of compressi

This is a high-performance Go compression library providing implementations of Zstandard, Snappy, and Huffman coding. It includes a parallel compression framework for distributing gzip and stream workloads across multiple CPU cores and a specialized Huffman codec optimized for modern CPU architectures. The library features a Zstandard implementation that supports custom dictionaries and allocation-free decoding, alongside a Snappy compatible encoder for high-throughput data processing. It provides specific tools for dictionary generation and optimization to improve compression ratios for smal

qs is a query string parsing and serialization library used to convert URL query strings into JavaScript objects and transform objects or arrays back into URI-encoded strings. It functions as a secure parser and URI encoding utility, specifically designed to handle nested data structures. The library distinguishes itself through configurable nesting styles and array serialization formats. It provides support for custom character encoding logic and utilizes charset sentinels to manage conversions between UTF-8 and ISO-8859-1. To prevent resource exhaustion and security vulnerabilities, the pr

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PrivateBin is a self-hosted, zero-knowledge text hosting service and secret sharing tool. It utilizes browser-based AES 256-bit encryption to ensure that data is encrypted on the client side before transmission, meaning the hosting server cannot read or recover the original content. The project distinguishes itself by using URL fragments to distribute decryption keys, preventing the secret key from ever being sent to the server. It supports the distribution of both encrypted text and files, which are compressed and encrypted locally prior to storage. The platform includes capabilities for an

SharpZipLib is a .NET compression library and file archiver used to create, extract, and manage Zip, GZip, Tar, and BZip2 archives. It provides a framework for compressing and decompressing data streams and files within the .NET ecosystem. The library distinguishes itself through support for archives that exceed the standard four gigabyte size limit. It also includes capabilities for decrypting password-protected files using industry-standard encryption and managing Tar archives with long filename support. The project covers a broad range of archive management operations, including integrity

This project is a comprehensive collection of computer science implementations and an algorithm tutorial repository. It serves as a study guide and reference for competitive programming, providing executable code examples that demonstrate fundamental algorithmic problem solving and mathematical computation. The library covers a wide range of specialized domains, including cryptography and security primitives, lossless data compression techniques, and computational geometry for spatial analysis. It also features implementations of machine learning models, linear algebra operations, and formal

zip.js is a JavaScript library designed for creating, reading, and extracting ZIP archives directly within a web browser. It provides a comprehensive toolkit for managing compressed files and encrypted data storage entirely on the client side, eliminating the need for server-side backends or external dependencies. The library distinguishes itself by utilizing the Web Streams API and multi-core processing to handle large datasets efficiently. By offloading heavy compression and decompression tasks to background worker threads, it ensures that the browser interface remains responsive during int

Common.Utility is a general purpose utility library providing a collection of helper classes for common programming tasks. It functions as a data security framework, a database access wrapper, and a suite of tools for system administration and network communication. The library includes a multimedia processing suite for generating barcodes and QR codes, editing images, and converting video formats. It also provides a network communication toolkit for managing HTTP requests and FTP transfers, as well as integration with email and notification services. The project covers a broad set of capabi

js-base64 is a JavaScript library for encoding and decoding data between Base64 format and JavaScript strings or byte arrays. It provides utilities for converting binary data to Base64 strings and transforming those strings back into their original text or raw byte format. The project includes a Base64 string validator to verify if a sequence follows correct formatting, characters, and padding. It also supports the creation of URI-safe Base64 strings by replacing characters that would cause encoding errors in URIs and allows for the removal of padding. The library provides a prototype extens

File is a command-line utility and C library designed to determine the precise file format and media type of unknown files by inspecting their internal byte sequences, binary signatures, and hierarchical pattern rules rather than relying on file extensions. The software evaluates magic number signature matching and complex multi-byte offsets to classify files accurately. The engine supports recursive archive inspection, automatically unpacking compressed archive structures on the fly to analyze and identify internal nested file payloads. Human-readable pattern definitions can be compiled into

Masuit.Tools is a comprehensive static utility library for .NET and ASP.NET Core development. It provides a broad collection of reusable helper methods and infrastructure components that cover common programming tasks without requiring dependency injection or instance management. The library is organized as flat utility classes, making its functionality directly accessible from anywhere in a project. The toolkit distinguishes itself through a wide range of integrated capabilities that go beyond typical utility libraries. It includes a multithreaded range-request file downloader with pause and

Pinot is a distributed, columnar analytical database designed for high-concurrency, low-latency query processing. It functions as a real-time OLAP datastore, enabling interactive, user-facing analytics by ingesting and querying massive datasets from both streaming and batch sources. The system architecture relies on a centralized controller for cluster coordination and a distributed segment-based storage model to ensure horizontal scalability. The platform distinguishes itself through a hybrid ingestion pipeline that unifies real-time event streams and historical batch data into a single quer

DevToysMac is a native macOS developer utility suite designed to encode, decode, and transform common data formats. It serves as a centralized tool suite for formatting and converting developer data into human-readable or machine-compatible strings. The application provides a set of tools for developer data manipulation, including JSON validation and formatting, Base64 encoding and decoding, and URL encoding and decoding. It also includes a text manipulation toolkit for cleaning up configuration files and developer logs through common string operations. The software is built as a SwiftUI des

Proxyman is a cross-platform HTTP debugging proxy that captures, inspects, and modifies HTTP, HTTPS, and WebSocket traffic. It functions as a man-in-the-middle proxy, decrypting SSL/TLS traffic to allow real-time inspection and modification of encrypted requests and responses. The tool is designed for debugging web and mobile applications, with capabilities for API mocking and simulation, scriptable traffic modification, and team collaboration on network logs. What distinguishes Proxyman is its deep integration with mobile and cross-platform development workflows. It provides automated certif

pysheeet is a technical reference library providing a curated collection of code snippets and implementation patterns for advanced Python development, system integration, and high-performance computing. It serves as a comprehensive guide for implementing low-level network programming, native C extensions, and asynchronous and concurrent programming. The project provides specialized frameworks for the development and deployment of large language models, including tools for distributed GPU inference and high-performance serving. It also includes detailed patterns for high-performance computing

Lancet is a comprehensive extension of the Go standard library, providing a collection of reusable functions and data structures designed to reduce boilerplate code in applications. It serves as a general-purpose toolkit across multiple domains, including concurrency, security, networking, and functional logic. The project distinguishes itself through specialized toolkits for Go concurrency, such as keyed locking and channel-based stream processing, and a dedicated functional programming kit that supports currying and function composition. It also includes a dedicated cryptography library imp

The ECMAScript specification is the formal standard defining the syntax, semantics, and execution model that all JavaScript implementations must follow. It establishes the official language rules through a combination of formal grammar and step-by-step algorithmic prose. The project manages the technical evolution of the language via a consensus-driven governance framework and a staged proposal pipeline. This process tracks features from initial design through expert reviewer sign-off and committee approval. A specification-as-code toolchain compiles these formal definitions and algorithmic d

LOLBAS is a curated database and knowledge base of signed Windows binaries that can be misused to bypass security restrictions and execute unauthorized code. It serves as a technical registry that maps trusted system files to their functional capabilities and the offensive tactics they enable. The project distinguishes itself by providing a capability-driven indexing system and a tactics registry that relates legitimate binary functionality to known security evasion techniques. It includes an association layer that links specific system binaries to attack patterns and tactical objectives, pro

This tool is a command-line processor designed for querying, updating, and transforming structured data files. It functions as a versatile engine for manipulating YAML, JSON, TOML, and XML documents, allowing users to perform complex operations directly from the terminal. By utilizing a path-based expression language, it enables precise navigation and modification of data structures within configuration files and infrastructure-as-code workflows. What distinguishes this tool is its ability to perform in-place document mutations while preserving original formatting, comments, and metadata. It

This is a header-only C++ library that provides implementations for HTTP clients, HTTP servers, and a WebSocket framework. It allows for the creation of network services and the consumption of remote APIs without requiring a separate compilation step or external binary linking. The project features backend-agnostic TLS integration for secure HTTPS and WSS communication and employs a thread-pool model to process concurrent requests. It distinguishes itself with a full-duplex WebSocket state-machine and a middleware-based request pipeline that supports regular-expression path routing. The libr

CasperJS is a scripting utility and testing framework for automating web scenarios via headless browsers. It enables the execution of navigation steps and form inputs to automate complex user scenarios, extract web data, and validate the state of remote pages. The project provides specific tooling for PhantomJS and SlimerJS, allowing users to write programmable sequences for web navigation and data extraction. It includes capabilities for capturing visual snapshots of full pages or specific elements to perform user interface regression testing. The framework covers broad automation areas inc

MIDI.js is a JavaScript library for playing MIDI files and triggering musical notes within web browsers. It functions as a web MIDI library and soundfont audio synthesizer, providing the core engines necessary to render instrument sounds for multiple simultaneous tracks. The project includes a specialized MIDI-to-visual sync engine that interpolates musical events into continuous animation loops to synchronize visuals with audio playback. It also provides a soundfont code generator to convert audio instrument files into base64 code for direct browser consumption. The library covers MIDI file

redis-rdb-tools is a collection of specialized utilities for parsing, analyzing, and converting binary Redis database dump files. It functions as a parser and converter that extracts keys and values from these snapshots to facilitate data recovery, migration, and analysis. The project distinguishes itself through capabilities for memory profiling and snapshot manipulation. It includes a memory analyzer that generates key-level consumption reports to identify storage inefficiencies and a manipulation utility capable of merging multiple dump files or splitting single snapshots into smaller part