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OnlineTextCompare

onlinetextcompare.com

OnlineTextCompare is a free, browser-based two-way text diff and merge tool. It requires no signup or installation, and all comparisons run locally in the user's web browser for privacy and security. The tool highlights differences between two text inputs using red and green arrows, supporting use cases such as reviewing edits and merging content changes. It also offers additional comparison tools for formats including HTML, CSS, JavaScript, JSON, XML, SQL, Excel, PDF, and lists.

OpenCV

opencv.org

OpenCV is an open source computer vision library that contains over 2500 algorithms and supports model execution for machine learning and artificial intelligence. It was designed to be cross-platform, written in C with C++ and wrappers for Python and Java, and runs on desktop and mobile systems. A GPU module implemented with CUDA provides acceleration for part of the library.

OpenHab

openhab.org

openHAB is a vendor- and technology-agnostic open source automation software for the home, developed in Java on Apache Karaf. Its pluggable architecture supports over 400 technologies and thousands of devices, with rules driven by time, events, scripts, actions, notifications and voice control. It runs on Linux, macOS, Windows, Raspberry Pi, Docker and Synology, and is accessed through web, iOS and Android apps. It runs on local hardware without requiring cloud services.

OpenRocket

openrocket.info

OpenRocket is a free model rocket simulator that allows users to design and simulate rockets before building and flying them. It offers a six-degrees-of-freedom flight simulation, CAD-based design, real-time performance data and design optimization. It is written in Java and is cross-platform, with source code available under the GNU GPL.

OpenSpeedTest

openspeedtest.com

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

openstego.com

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

optunity.readthedocs.io

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

orteil.dashnet.org

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

ossia.io

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

overapi.com

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

packsmc.com

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

codeberg.org

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

pairdrop.net

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

codeberg.org

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.

PCjs Machines

pcjs.org

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.

PictoChat Online

pict.chat

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

sindresorhus.com

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.

PocketBase

pocketbase.io

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

politepaul.com

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

prettier.io

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

proimagetool.com

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

programiz.com

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.