Typ.ing is a typing trainer intended to help users type faster and more accurately with an external keyboard. The site describes it as clean and simple and notes it works better with a physical keyboard rather than a mobile device.
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The U.S. Climate Resilience Toolkit is a website offering resources on understanding climate-related risk and practical ways to address it. It includes Steps to Resilience, topics and sectors, training, a registry of experts, and a help desk with FAQs and technical resources.
UFO Evidence is a website presenting research, resources, news and information on the UFO phenomenon. It includes sections on selected UFO cases, photographs, sighting reports, and articles on topics related to the UFO and extraterrestrial phenomenon. The site describes itself as one of the largest internet sites on the subject.
Ulauncher is an application launcher for Linux. It performs fuzzy search that remembers previous picks and auto-selects the best option, and ships with four built-in themes with support for custom color themes. Personalized shortcuts and extensions provide quick access to scripts and searches, and a directory browser opens by typing ~ or /. Package instructions are listed for Ubuntu, Arch, Fedora, OpenSUSE and CentOS 7.
UMLet is a free, open-source UML tool with a simple user interface for drawing UML diagrams. Sequence and activity diagrams can be created from plain text, and diagrams can be exported to eps, pdf, jpg, svg and the clipboard. It is available as a stand-alone app for Windows, macOS and Linux, as an Eclipse plugin, as the UMLetino web app and as a Visual Studio Code extension.
unblob is an extraction suite that parses unknown binary blobs for more than 30 archive, compression and file-system formats. It extracts content recursively and carves out unrecognized chunks. It is free under the MIT license, offers a command line interface and can be used as a Python library. It was developed and is maintained by ONEKEY.
Searchable archive of Discord leaks used for research into extremist networks and online communities.
UniSat is an open-source Bitcoin browser extension wallet with tools for minting, trading, exploring and managing assets. It supports Ordinals, Runes and Alkanes, and the site also links to its ecosystem products UniScan, an explorer, and UniHexa, a liquidity market for Bitcoin-native assets.
Universal Installer is an Android app for installing and managing APK packages on phones, Android TV and Wear OS. It supports split APK bundles and manual splits, extracts OBB game data, and offers silent install via Shizuku, root or the system installer. It also provides VirusTotal hash lookups before install, local sharing to TVs, and an app manager.
The University of Manitoba is a research-intensive post-secondary institution in Manitoba. Its homepage links to admissions, academics, research, student supports and community information, and describes more than 250 undergraduate and graduate programs along with extended education programs and courses.
The University of Texas at Austin is a public research university. Its new Core Curriculum provides students with education across the arts and humanities, social sciences, and STEM. The university reports patents, externally funded projects, and economic contributions to Texas.
Unpackerr is a daemon that watches download folders or Starr apps such as Radarr, Sonarr, Readarr, Lidarr and Whisparr, then extracts completed archives so they can be imported. It runs on Windows, macOS, Linux, FreeBSD and Docker, and can also operate standalone on a watch folder.
Browser extension and API for finding legal open-access versions of scholarly papers.
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.
UnTrap is a browser extension that customizes YouTube by hiding Shorts, recommendations, comments and other distracting elements. It also offers scheduling, session limits, presets and video summaries. A free tier is available, and a Plus plan is offered at $3.99 per month or $35.99 per year.
unxip is a command-line tool designed for rapidly unarchiving Xcode XIP files and writing them to disk with good compression, aiming to outperform Bom. It can also read from a stream and extract to a specified directory. It is available as a precompiled binary for macOS 12.0 and later, through MacPorts and Homebrew, and can be built with Swift.
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.
Update Scanner is a Firefox addon that monitors web pages for updates, intended for websites that do not provide Atom or RSS feeds. Users can add pages, choose how often changes are checked, and opt to ignore minor updates. Detected changes appear in a notification panel and highlighted in yellow, and updated items are listed in a sidebar.
Upgini is an open-source data search and enrichment library for Machine Learning and AI pipelines. It enables users to find and add relevant features from hundreds of public and premium external data sources, including open and commercial large language models.
Uploadcare Widget is an HTML5 file upload tool that supports multiple file uploads, drag and drop functionality, validation by file size, file extension, and MIME type, upload progress bars, and image previews. A deprecation notice for the jQuery File Uploader component is included in the repository. It is hosted as a public repository on GitHub.
Upscaling refers to the ultimate-upscale-for-automatic1111 project, an upscaling extension for the AUTOMATIC1111 Stable Diffusion web UI. The public repository includes instructions, reference materials, example content, and API usage documentation for the tool, and contributions to the project are accepted from the public.
The USACO Guide is a free collection of curated competitive programming resources intended to take contestants from USACO Bronze to USACO Platinum and beyond. It includes modules, extensive problemsets, progress tracking and a forum, and the guide states it is not an official syllabus.
Chrome extension that provides a lot of useful scripts
User Scanner is a two-in-one email and username OSINT suite with native MCP support. It performs deep data extraction from a single email or username, analyzing over 1080 maintained scan vectors, including more than 200 email and 880 username sources. It is intended for security research, investigations, and digital footprinting.