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OpenSpeedTest is a browser-based HTML5 internet speed test that measures download, upload, ping, and jitter without Flash or Java. It works on phones, TVs, consoles, and computers. A free and open-source self-hosted server can be deployed, and a speed test widget can be embedded on websites or apps.
OpenStego is a free steganography tool written in pure Java. It provides data hiding, which hides data within a cover file such as an image, and beta watermarking, which embeds an invisible signature to detect unauthorized file copying. It supports password-based encryption with AES 128 and AES 256 and a plugin architecture.
A list of recommended OptiFine alternatives for Minecraft: Java Edition, organized into performance, cosmetic, shader, fog and utility categories. Listed mods must be publicly available and respect the Mojang EULA, and cheat clients are excluded. The page includes version ranges for entries such as Sodium on Fabric and NeoForge.
Optunity is a Python library containing various optimizers for hyperparameter tuning. It provides several approaches to solving tuning problems, including cross-validation facilities and score functions. The documentation states it is supported in R, MATLAB, GNU Octave and Java through Jython, and is free software under a BSD-style license.
Orteil's homepage is the personal site of a developer who makes toys and games in JavaScript with help from Opti. It lists games including Cookie Clicker, Neverending Legacy, Nested, Genesis, and Murder Games, plus tools such as RandomGen, Idle Game Maker, and the Video Game Generator.
ossia score is a free, open-source intermedia sequencer for Windows, macOS and Linux. It sequences audio, video, OSC, MIDI and DMX on an interactive timeline and supports scripting with JavaScript and Faust. It is used for interactive shows, installations and live electronic music.
OverAPI.com is a site that collects all the cheat sheets. It organizes reference sheets for programming languages, frameworks, and developer tools, listing topics from Python and JavaScript to HTML, SQL, and Linux.
PacksMC is a site for downloading free Minecraft Java Edition texture and resource packs across versions from 1.8.9 to 1.21. It offers in-browser preview, creator communities and an in-browser pixel editor. Creators upload a pack once, and the site rebuilds it across eight Minecraft versions and publishes it with in-game screenshots. A Packs+ membership is also offered.
Pages is a repository hosting the website of ranger, a file manager. The repository contains the site's HTML, CSS, and JavaScript files, and documents how to build the site, add news, and deploy it.
PairDrop is an open-source, peer-to-peer cross-platform file transfer tool. It allows users to instantly share images, videos, PDFs and links with people nearby, with no setup or signup required. The service requires JavaScript to function and supports multiple languages.
Patchy is a temporary file uploader that is easy to host, described as a replacement for Uguu. It uses a low amount of memory, works without JavaScript, and can be used from other software such as Chatterino2 and ShareX. It is written primarily in Crystal.
Pavlov.js is a reinforcement learning library that uses Markov Decision Processes. It is written in C++ and compiled to JavaScript. The package is installed through npm. Users define transitions and rewards, then call learn to derive a policy and query actions for states.
PCjs Machines offers online machine emulators written in JavaScript. It runs DOS, Windows, OS/2 and other vintage PC applications in a web browser on desktop computers, iPhones and iPads. Emulations also cover microcomputers, minicomputers, terminals, programmable calculators and arcade machines, alongside an archive of historical software and documentation.
PEmbroider is an open-source, cross-platform lightweight Java library for generative embroidery design that integrates with the Processing creative coding framework. It is intended for artists, craftspersons, educators, makers, and schools, and can generate embroidery files in .DST, .EXP, and .JEF formats. The library was developed at the CMU Frank-Ratchye STUDIO for Creative Inquiry and is released under the GNU General Public Licence (GPLv3) and Anti-Capitalist Software License (ACSL 1.4).
PictoChat Online is a PictoChat web app with a server written in Java. The page offers options for username, color, volume, pressure, integer scaling, dark mode support and sharing tripcodes without a Discord account.
Pixel It is a JavaScript library for converting an image into pixel art. Users can set the pixel block size, apply a color palette, or convert an image to pixel grayscale. Palettes can be uploaded from .hex, pixilart.com txt, or Paint.net TXT files, or set manually. A live page allows changes to block size, palette, and maximum height and width.
Plash is a free macOS app that sets any website as the desktop wallpaper, such as a calendar, dashboard or animated GIF. It supports multiple websites, automatic reloading at a custom interval, Browsing Mode for interacting with the page, and custom CSS and JavaScript.
Plupload is a JavaScript API for building file uploaders. It supports multiple file selection, file filtering, chunked upload, client-side image downsizing, and can fall back to alternative runtimes including Flash and Silverlight when necessary.
PocketBase is an open-source backend tool distributed as a single file. It includes a realtime database, user authentication, file storage, and an admin dashboard. It can be used as a standalone application or extended via Go and JavaScript hooks, and integrates with common frontend development stacks.
PolitePaul is a tool for generating RSS feeds from web pages without writing code. It supports dynamic content powered by JavaScript, an XPath selectors editor, smart filters for words and phrases, and feed monitoring with email notifications. Feeds can be fetched in XML and JSON formats.
Prettier is an opinionated code formatter that supports many languages, including JavaScript, TypeScript, CSS, HTML, JSON, GraphQL, Markdown and YAML. It reprints code from scratch, taking line length into account, to enforce a consistent style across a codebase. Prettier integrates with most editors.
Pro Image Tool is a set of free, client-side web utilities for image resizing, format conversion and PDF management. Files are processed inside the browser using HTML5 Canvas and JavaScript, so they are not uploaded to a server. The site includes AI tools, image resizers, format converters and PDF utilities.
Programiz provides free online compilers and code editors that run in a browser for languages including Python, JavaScript, SQL, C, C++, Java, HTML and CSS. It also offers interactive lessons with practical code that can be run directly in the browser. The site states no installation or sign up is needed.
PublicWWW is a source code search engine that searches HTML, JavaScript, CSS and plain text in web page source code, supporting queries such as regex and ccTLDs. It also offers an API and an MCP server for AI assistants.
