Open-source alternatives to Formidable

GraphQL Upload is a utility for Node.js environments that enables GraphQL servers to process file uploads. It functions by integrating custom scalar types into the GraphQL schema and providing middleware to intercept and parse incoming multipart requests. The library distinguishes itself by handling file data as asynchronous readable streams, which allows servers to process large files without requiring intermediate local disk storage or loading entire files into memory. It also incorporates resource protection mechanisms, including configurable limits on file sizes and the total number of fi

aliyundrive-webdav is a server-side gateway that translates AliyunDrive cloud storage into a WebDAV interface. It functions as a self-hosted cloud file server that maps remote storage accounts to a local network drive, allowing users to manage files through standard network drive clients. The project distinguishes itself by routing data requests directly between the client and the cloud provider to enable direct media streaming without server-side proxying. It utilizes a terminal-based QR code authentication system to exchange scans for refresh tokens and maintains a secure cloud gateway usin

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

React Email Editor is a drag-and-drop visual builder for creating responsive email templates, built as a React embeddable component. It also serves as an AI-powered email designer, a collaborative email design tool, and a React component library for composing emails programmatically with JSX. The editor represents designs as structured JSON and supports multi-format rendering for email clients, web pages, and PDF. What distinguishes this editor is its deep AI integration: users can generate full email templates from natural language, rewrite text with chosen intent, produce multiple text vari

URI.js is a full-featured JavaScript library for parsing, building, normalizing, and mutating URLs and their components programmatically. It provides a mutable-component object model that exposes each URL part as a separate object with getter and setter methods, enabling direct manipulation of schemes, hosts, paths, query strings, and fragments. The library implements strict RFC 3986 compliance for encoding, decoding, and normalization of URI components, and includes a template expansion engine that substitutes variables using operator-specific rules. The library distinguishes itself through

This is a suite of JavaScript utilities for the bidirectional conversion and manipulation of URL components and query parameters. It provides a mechanism for parsing URL query strings into data objects and serializing those objects back into URL-encoded strings. The library includes functions for filtering, isolating, and modifying parameters within a full URL or query string. It supports the construction of complete web links by combining base addresses with formatted query parameters. The toolset covers data transformation primitives such as alphabetical key sorting, input sanitization, an

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

http-parser is a C library designed for zero-copy HTTP message parsing, URL deconstruction, and the management of protocol upgrades and chunked encoding. It provides utilities to extract headers, methods, and status codes from HTTP requests and responses. The project includes a zero-copy URL parser for deconstructing strings into individual components and a mechanism for detecting protocol switch requests to identify the exact byte offset where non-HTTP data begins. It also features a decoder for handling chunked transfer-encoded data streams.

This project is a cloud drive media aggregator and storage proxy that merges content from multiple cloud storage providers into a unified directory. It functions as an M3U playlist generator, converting cloud files and streaming sources into standardized formats for use in external media players. The system acts as a plugin host for Python-based scripts to fetch and parse content from third-party websites. These operations are supported by a local proxy to accelerate request loading and bypass network restrictions. The software includes a web-based interface for managing server settings and

Melody is a cross-platform music downloader and archive manager designed to retrieve audio tracks from various video and audio websites for local or cloud storage. It functions as a playlist synchronizer that automatically copies songs from online playlists to personal storage via scheduled background tasks. The system includes a music track recovery mechanism that identifies unplayable or deleted songs in a playlist and replaces them with functional versions found in public web resources. It utilizes a cloud storage media pipeline to stream discovered audio files from source servers through

BaiduPCS-Go is a Go library and cloud storage client that provides a programmable interface for interacting with Baidu Cloud Storage. It functions as an API wrapper and remote file manager, allowing users to manage files, folders, and accounts without using a web browser. The project includes specialized utilities for extracting direct download URLs to bypass web downloaders and managing multiple cloud identities through session tokens and cookies. It also enables remote file transfers, allowing content from shared links to be moved directly into a cloud account. The system covers a broad ra

bypy is a Python client for interacting with Baidu Yun cloud storage via its official API. It functions as both a library for programmatic integration and a command-line manager for organizing and listing files within a cloud account. The project features a multi-process transfer tool that utilizes parallel processing to accelerate high-volume uploads and downloads. It provides bidirectional directory synchronization to align content between local file systems and remote cloud storage by identifying missing or outdated files. The tool covers recursive file transfers, automated cloud data bac

Judge0 is an online code execution engine and multi-language compiler API designed to compile and run source code within isolated sandboxes. It functions as an asynchronous job processor that handles code submissions via a queue and provides a secure environment to run arbitrary programs while preventing unauthorized system access. The system distinguishes itself through a multi-stage compilation pipeline and a flexible execution model that supports both single-file submissions and multi-file program execution via archives. It employs an isolate-based sandboxing mechanism to enforce strict ha

Pingvin Share is a self-hosted file sharing platform designed for uploading and distributing files via secure links. It provides a private alternative to third-party cloud services for managing file transfers. The platform integrates an external security engine to scan uploaded files for malware and threats before they become available. It supports identity management through OpenID Connect integration, allowing user authentication to be delegated to external identity providers. Storage is managed through a gateway that supports both local disk drives and S3-compatible cloud object storage.

Ouch is a command-line archive utility designed for compressing and decompressing files across multiple formats, including zip, tar, 7z, and zstd. It functions as a secure archive processor that sanitizes metadata to prevent path traversal attacks and terminal injection during extraction. The tool features a chain compression pipeline that allows for the sequential application of multiple compression algorithms by parsing chains of file extensions in a filename. It also includes a dedicated accessibility mode that optimizes terminal output for screen readers and text-to-speech technologies by

Fine Uploader is a browser file upload widget and manager that provides a frontend interface for transferring multiple files. It functions as a chunked file upload manager and a client-side image processor. The project enables the direct transfer of files to cloud storage providers, specifically Amazon S3 and Microsoft Azure, to reduce the load on application servers. It includes tools for scaling and resizing image dimensions during the upload process to save bandwidth. The system manages large file transfers by splitting them into small pieces, allowing for pause and resume functionality.

AfuseKt-release is an Android media player application designed for playing and organizing video content across various network protocols and cloud storage services. It functions as a network video streamer and a cloud storage video client. The application enables the streaming of movies and shows directly from cloud storage services such as Aliyun Drive, 115, and Alist. It also provides access to self-hosted media servers, including Emby, Plex, and Jellyfin. The system includes a metadata scraping engine that retrieves information from external databases to organize raw media files into a s

Reach Router is a client-side routing library for React applications that maps URL patterns to components without full page reloads. It defines navigation rules and component rendering through declarative route configuration, using nested React component trees instead of separate configuration files. The library supports parent-child route hierarchies so shared UI elements persist across page transitions, and provides a declarative Navigate component that triggers URL changes and view updates when rendered. It extracts dynamic segments from URL patterns and passes them as props to matched rou

http-parser is a C-based library for extracting request and response metadata from raw HTTP data streams. It utilizes a state-machine approach to identify message segments and boundaries. The project implements zero-copy string parsing and pointer-based URL deconstruction to avoid memory allocations and data duplication. It supports incremental stream processing to handle fragmented data chunks and includes mechanisms for decoding chunked encoding and managing network protocol upgrades.

Cyberduck is a multi-protocol file transfer client and cross-platform file manager for Mac and Windows. It functions as a cloud storage manager and remote storage mounter, allowing users to upload, organize, and synchronize data between local drives and remote endpoints. The application provides a unified interface for managing files across FTP, SFTP, WebDAV, S3, and other cloud storage protocols, including Amazon S3, Backblaze B2, Microsoft Azure, and OneDrive. It distinguishes itself with a client-side encryption vault that encrypts files and folders locally before they are transmitted to r

PicList is a cloud image upload manager and storage file browser designed to facilitate image hosting for Markdown documents. It serves as a bridge between document editors and cloud providers, providing a local server that accepts image uploads and returns formatted Markdown or HTML links. The tool features an image preprocessing pipeline that applies watermarks, compression, and custom renaming patterns before files are uploaded. It supports synchronization of application settings, image albums, and plugins across multiple devices using WebDAV and Git. The system manages files across vario

CarrierWave is a Ruby file upload library used to manage the uploading, storing, and retrieval of files within web frameworks such as Rails and Sinatra. It functions as an Active Record file manager that associates uploaded assets with database records. The project includes an image processing pipeline for generating thumbnails and derivative versions of uploaded images. It also features a file validation engine to restrict uploads based on allowlists or denylists of extensions and content types, and provides cloud storage integration to manage assets on remote providers. The library covers

Sprig is a comprehensive library of helper functions designed to extend the Go text template engine. It provides a wide array of custom functions that can be injected into the engine to enable complex data manipulation and logic directly within templates. The project offers specialized capabilities for cryptography, including the generation of private keys, X.509 certificates, and secure password hashes. It also includes advanced logic extensions for semantic versioning comparison, ternary evaluations, and the resolution of environment variables from the host operating system. The library co

nuqs is a TypeScript library for managing React component state through the browser's URL query string. It provides a type-safe hook-based approach that synchronizes component state with the address bar, enabling shareable and bookmarkable application states. The library handles parsing and serializing URL query parameters into typed JavaScript values, supporting integers, floats, booleans, dates, and custom types with bijectivity verification. The library distinguishes itself through its comprehensive approach to URL state management, combining batch URL updates that merge multiple parameter

Filegator is a web-based file manager and self-hosted file sharing portal. It functions as a cloud storage gateway that allows users to organize, upload, and download files across local disks and various cloud storage providers through a single unified interface. The system features a multi-backend authentication provider capable of verifying identities via JSON files, databases, or external directory services. It includes a role-based access control system that manages user permissions, assigns home folders, and restricts access to specific files and system routes. The platform provides cap

uPic is a native macOS application designed for uploading images and files to cloud hosting services and private backends. It functions as a cloud image hosting tool and a custom API upload client that generates formatted links for shared content. The project distinguishes itself by allowing users to configure private backend endpoints with specific HTTP methods, headers, and server URLs. It converts uploaded file addresses into Markdown or HTML snippets, which are then written back to the system clipboard via customizable URL templates. The application integrates with macOS system framework

pdfcpu is a Go PDF processing library and command-line interface designed for programmatically manipulating, optimizing, and validating PDF files. It provides a toolkit for document content modification and structural management. The project distinguishes itself as an optimization tool and layout engine, capable of reducing file sizes and improving loading speeds by streamlining internal structures. It also functions as a security manager, providing password-based encryption, decryption, and digital signature verification. Its capability surface includes page management for merging, splittin