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Unrar online is a browser-based service that extracts the contents of RAR archives without installing WinRAR or other software. It supports archives over 1 GB and password-protected RAR files, and the extracted content can be downloaded as a single ZIP or as individual files.
UnrealIRCd is an open source IRC server serving thousands of IRC networks since 1999. It runs on Linux, FreeBSD, NetBSD, macOS and Windows and features module support, IRCv3 support, SSL/TLS, anti-flood and anti-spam systems, and GeoIP lookups.
A plugin that rewrites AI-generated output to remove stock phrasing, sycophancy, hedging stacks and em-dash pileups while preserving code, URLs and headings. It is offered for Claude Code, Cursor, Windsurf, Codex, Cline, Copilot and Gemini.
unzip-online is a web tool for extracting .zip and .rar files without installed software. Files are uploaded, uncompressed, and the extracted files downloaded. Uploaded files are deleted after 24 hours and files up to 200MB are supported.
Upd.dev is a code hosting and package distribution platform built on Forgejo, with diffs rendered by Pierre. It presents itself as a smaller, quieter alternative to GitHub for creating repositories, pushing code and shipping releases. It natively serves packages for Go, Rust, Arch and other ecosystems directly from repositories, and infrastructure is geo-distributed across US and EU regions.
Uptime Kuma is a GitHub repository or organization with source code, releases, documentation, or project resources.
URLhaus is a platform operated by abuse.ch with the purpose of sharing malicious URLs used for malware distribution. It allows reporting URLs and browsing a database of malicious URLs. APIs enable pushing and pulling signals and automating bulk queries, and Spamhaus datasets enhanced by URLhaus are offered for threat hunting, email protection and network protection.
Provides fictional US identity number generators for testing forms and software applications.
Use The Keyboard is a collection of keyboard shortcuts for Mac applications, Windows programs and a wide range of websites. The platform allows users to search for shortcuts, and includes entries for popular tools and services including Notion, Figma, Discord, Zoom, Microsoft Office applications, Adobe creative software, development tools, social media platforms, and many other programs.
A curated list of tools and programs for developers, devops, admins, and others, organized into categories such as architecture and diagrams, API development, and backup and archiving. Most listed items are open source, though not all, and the page advises checking applicable licences. The project is hosted on GitHub.
A list of useful tools and programs for developers, DevOps and sysadmins, described as based on the familiar "awesome" lists but maintained as its own version. The project also serves a linked site, and users can build the docs locally with VuePress after installing dependencies.
UseHooks is a collection of modern, server-safe React hooks from the ui.dev team, offered as an npm package. The library covers tasks such as debouncing, local and session storage, window size tracking, media queries, network state, fetch, geolocation, clipboard copying and timers. The site also presents guides for building the hooks yourself.
Usenet Guide / Automation Setup is a public Google document or spreadsheet containing organized links, notes, data, or resources.
A page that presents Usenet deals, discounts and promotional offers from Usenet providers, with a comparison of pricing and features. Deal content loads dynamically, so the listings themselves are not present in the saved page.
Usenet-Uploaders is a GitHub repository or organization with source code, releases, documentation, or project resources.
Discord invite is a developer community or publication for programming discussions, news, tutorials, and help.
UTM is virtualization software for Mac that runs Windows and Linux and emulates other operating systems. It uses QEMU and Apple's Virtualization framework and emulates processors including ARM32, MIPS, PPC and RISC-V. macOS virtual machines are limited to Apple Silicon Macs running macOS Monterey or later. GPU emulation and 3D acceleration are not supported.
UUID Tools is an open-source, free online tool and API for generating UUIDs and GUIDs on the fly, including version-1, version-3, version-4 and version-5. The API requires no authentication, allows up to 100 UUIDs per request and is limited to 60 requests per minute per IP address. It also offers a UUID decoder and bulk generator.
uv is a GitHub repository or organization with source code, releases, documentation, or project resources.
UZDoom is the primary ZDoom port, offering OpenGL and Vulkan hardware rendering plus enhanced software rendering. LZDoom is an alternative port with a different feature set, and the parent ZDoom codebase has been discontinued. Users must provide their own game IWAD.
v0 is a Vercel-built collaborative AI assistant for designing, iterating, and scaling full-stack web applications. It supports prompt-based app building, template starters, design mode editing, design system creation, repository syncing, third-party app integration, and direct deployment to Vercel. The tool is described as agentic by default, and offers multiple plan options for different user types.
Val Town is a platform for deploying code to live URLs. It supports cron jobs, REST APIs, webhooks, email, SQLite data storage, npm and Deno modules, and generating images and PDFs. A CLI allows editing code locally and deploying changes instantly, and AI coding tools can be used with it.
Valinor is a GitHub repository or organization with source code, releases, documentation, or project resources.
Valuta EX is a currency converter providing exchange rates for over 160 world currencies, plus cryptocurrencies. Rates are mid-market rates drawn from live market data and refreshed hourly. Conversion pages compare typical dealer margins of 0–5% charged by banks, ATMs, credit cards and exchange kiosks. It is developed by inkOfPixel Srl, a software company based in Milan, Italy.
