upscayl.org
Upscayl is a free and open source AI image upscaler for Linux, MacOS and Windows. It uses AI to upscale images, offers multiple models and batch processing, and can enhance images by up to 16x.
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upstract.com
Upstract collects or organizes headlines and links for browsing news from multiple sources.
upx.github.io
UPX is a free executable file compressor for several executable formats, including Windows programs and DLLs, macOS apps and Linux executables. It typically reduces the file size of programs and DLLs by around 50%-70%, and compressed programs are self-contained. It is distributed under the GNU General Public License with full source code available.
github.com
Open-source project that provides machine-learning models, research, training resources, or evaluation tools.
hsa00000.github.io
Urocissa is a free and open source self-hosted gallery built with Rust and Vue, designed for massive photo collections. It serves millions of photos on a 4GB RAM server using an in-memory cached database and virtual scrolling. It offers instant boolean search and a standalone executable for Windows and Linux.
yumemi.moe
Usagi is a multilingual open source manga reader for Android, described as simple and convenient and made from and for the community. It uses plugin-based sources and a customizable interface, and lists new display and arrangement modes and a backdrop image among its features. The project is GPL-3.0 licensed.
bztsrc.gitlab.io
USBImager is a simple GUI application that writes compressed disk images to USB drives and creates backups. It is available for Windows, MacOS and Linux, and its interface is minimalist and multilingual. The application is Open Source under the MIT license.
trolologuy.github.io
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.
useplaintext.email
Use plain text email is a guide explaining plain text and HTML email, recommending email clients that compose plain text by default and giving setup instructions for other clients. It also covers etiquette recommendations and reasons to prefer plain text, and is brought to you by sourcehut.
userstyles.world
UserStyles.world is a free and open-source, community-driven platform for sharing and browsing UserCSS userstyles, described as a replacement for UserStyles.org. It offers tracker-free browsing, Stylus integration for publishing updates, and mirroring of userstyles from other places including the USo-archive. It is licensed under AGPLv3.
getutm.app
UTM is a free and open source app that runs virtual machines on iOS. It supports over 30 processors emulated by QEMU and can run operating systems such as Windows and Linux. It works on iPhone and iPad with iOS 11 and later, without jailbreak for iOS 11-13, and offers a native UI, console mode, sharing, and external input support.
uuidtools.com
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.
briano.dev
UWPHook is a small open-source project that adds Windows Store games and apps as non-Steam games on Steam. It loads installed UWP apps, automates the scripting and launching of Windows Store apps, and exports selected apps to Steam. It is licensed under the MIT License.
vaex.io
Vaex is an open-source Python DataFrame library for working with large tabular datasets without loading them fully into memory. It supports lazy opening of CSV files and processing of hundreds of millions or billions of rows per second. The project also offers consultancy and training services.
vanillalist.top
A handpicked collection of lightweight JavaScript plugins, components and libraries for use in web projects. The site indexes tools such as sliders, modal dialogs, select controls, date pickers, color pickers, image editors, animation libraries, charting libraries and lazy loaders, linking each to demo, source code and npm pages.
codeberg.org
Vcredist is a system utility for Windows, hardware checks, cleanup, process control, or desktop customization.
gitlab.com
Vcredist is a software project hosted on GitLab under the user abbodi1406, released under The Unlicense. The project was created on November 14, 2025, and as of the snapshot it had 94 commits, 1 active branch, 8 tags, and 7 releases, with a README file included in the repository.
vcvrack.com
VCV Rack 2 is a virtual modular platform based on Eurorack synthesizers. It is available as a free standalone version with free modules and open-source code, and as Rack Pro, which adds DAW plugin formats. It offers built-in and library modules, and can integrate with hardware and software.
vernam.app
VERNAM is a free, open-source file encryption tool that runs entirely in the browser. It encrypts any file with a passphrase using XChaCha20-Poly1305 and Argon2id, and no files or passwords are uploaded. It is published by PrivacyTools.io and offers an optional high security mode with heavier key derivation.
vert.sh
VERT is an open-source file converter that handles image, video, audio and document files. Processing is done on the user's device, and the site states there are no ads, no tracking and no file size limit.
vesktop.dev
Vesktop is a desktop client for Discord. It includes Vencord for plugins and themes, is open source without tracking or telemetry, blocks Discord telemetry, and is built with Linux in mind.
get.vial.today
Vial is an open-source cross-platform GUI and a QMK fork for configuring a keyboard in real time, available for Windows, Linux and Mac. It requires a Vial-compatible firmware installed on the keyboard, which the Vial GUI then automatically detects. Sources for all components are publicly available on GitHub.
vicinae.com
Vicinae is a keyboard-first launcher for the desktop. It provides a single interface for applications, file search, clipboard history, a calculator, an emoji picker, window management, browser tabs, fonts, theming, power management, shortcuts and scripts. Extensions can be built with React and TypeScript, and many Raycast extensions and script commands can run out of the box. It is free and open source.
lmsys.org
Vicuna-13B is an open-source chatbot trained by fine-tuning LLaMA on user-shared conversations collected from ShareGPT. Its code, weights and an online demo are publicly available for non-commercial use, and training cost around $300. The team reports a preliminary GPT-4-judged evaluation, described as non-scientific, showing more than 90% quality of ChatGPT and Bard.