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A self-hosted tool that searches many free book and audiobook sources at once, merges results into one ranked list, downloads files to the user's server and names and shelves each book. It is free and open source, and version 1.0 is a dockerised port of the former website.
RaveBSD is a self-hosted, free and open source search engine for free book and audiobook sources. It merges results from multiple sources into one ranked list, downloads files to the user's server, names and shelves books, and saves copies to devices.
RAWGraphs is a free and open source tool for data visualization. It is a web app that offers almost 30 visual models to visualize quantities, hierarchies and time series. Data inserted is processed only by the web browser, and projects can be saved or exported as vector or raster images.
Raw Web helps research websites, public data, search results, or online communities.
Rclone is a command-line program for managing files on cloud storage, described as an alternative to cloud vendors' web storage interfaces. It syncs directories between storage systems and supports over 70 cloud storage products, including S3 object stores and standard transfer protocols. It can mount local, cloud or virtual filesystems as a disk and is open-source software written in Go.
The RCSB Protein Data Bank is a member of the Worldwide PDB partnership that curates and annotates PDB data. It provides tools for searching, visualizing, and analyzing 3D structural data, including sequence and structure similarity searches. Users can browse annotations, download and analyze molecules.
The Research Data Center at ZPID is a platform for publishing and reusing psychological research data across fields of psychology. It offers support for documenting research data, assistance archiving data in PsychArchives, and provision of datasets and analysis structures such as PsychOpen CAMA for reuse.
RDPCIDAT is the research data repository of the RUB Research Department Plasmas with Complex Interactions. It provides access to data associated with the scientific publications of the department's principal investigators. The repository covers topics including plasma science fundamentals, plasma modeling and simulation, plasma chemical processes, plasma in liquids, plasma medicine and plasma for materials and surfaces.
React Bits offers free, open source React components for animated text, backgrounds, interactive cards and micro interactions. Components install as source the developer owns, and the library provides live demos with copyable source. Developers can choose JavaScript or TypeScript with plain CSS or Tailwind, and copy the source or install a component with the CLI.
React Suite is a suite of React components for building enterprise applications. It features 80+ components, responsive design, dark mode, internationalization, accessibility support, and TypeScript-ready code, and is free and open source. It can be installed with npm and used across frameworks including Next.js, Vite and Create React App.
ReadEra is an app for reading books, magazines, articles and documents in different formats, with notes, quotes and text translation. It supports EPUB, Kindle, FB2, PDF, DjVu, Word, ODT, TXT and comic formats, and opens books from ZIP and RAR archives. Reading is free, without ads or registration.
Readest is a free, open-source ebook reader for EPUB and PDF, available across macOS, Windows, Linux, Android, iOS, and Web. It supports highlights, notes, split-screen reading, text-to-speech, and cloud sync. The documentation also lists EPUB, PDF, MOBI, AZW3, FB2, CBZ, and TXT formats, with on-device, browser, or cloud TTS and translation and lookup tools.
ReadMedium is a service that uses artificial intelligence to translate and summarize Medium articles into a user's native language. To access an article, users modify the domain of a Medium article URL to readmedium.com, and the service can also use OpenAI o1 models for processing.
RealityRipple Software is a site by Andrew Sachen offering applications, utilities, Mozilla extensions and themes, described as free and open source. It hosts over a dozen applications and 30 Pale Moon extensions, with source code available for most applications and digitally signed installers. The site dates its work to April 14, 2003.
Dutch real estate market data platform.
Rebyte is an execution layer for enterprise agents. It runs agents in the cloud with durable execution, tools such as browsers, files, and compute, and policy controls over models, skills, MCP servers, and network access. Execution traces record model steps, tool calls, errors, tokens, and cost. The Agent API is compatible with the official OpenAI client and is described as model agnostic.
Online data library for locating reusable datasets and supporting materials.
RecipeRadar is free and open source software that helps users search for recipes by ingredients, plan meals and create food shopping lists. Its stated aims include reducing food wastage and supporting healthy, economical eating habits. The project is registered as a Community Interest Company in the United Kingdom.
RecipeSage is a free, open source recipe keeper, meal planner and shopping list manager for web, desktop, iOS and Android. It imports recipes from links, photos, PDFs and documents, syncs across devices, and works offline. Additional tools include nutrition tracking, cook mode, meal planning and shared lists.
Reciprocal Net is a distributed crystallography network and distributed database used by research crystallographers to store information about molecular structures, with much of the data available to the general public. It is funded by the U.S. National Science Foundation as part of the National Science Digital Library project and is still under development, with 18 participating crystallography laboratories online.
Recoll is a desktop document search application for Unix, Linux, Microsoft Windows and MacOS, built on the Xapian search engine library. It finds documents based on their contents as well as their file names and can search most document formats. The software is free on Linux, open source, and licensed under the GPL.
Rectangle is a macOS app that moves and resizes windows using keyboard shortcuts or snap areas. It is free and open source, supports macOS 10.15 and later on Intel and Apple Silicon, and can act as a drop-in replacement for Spectacle. A paid Rectangle Pro version adds custom shortcuts for any size and position.
Remove Empty Directories (RED) is an open source tool that batch deletes empty folders. It recursively searches below a start folder and shows empty directories before deleting them. It supports multiple delete modes, including deleting to the recycle bin, filter lists for white and black listing, and can treat directories containing empty files as empty.
Redacted is a free, browser-based image redaction tool for blurring, pixelating, or blacking out parts of an image. It runs entirely in the browser with no uploads, accounts, or tracking, and supports black box, pixelate, blur, and emoji masks. It opens JPEG, PNG, GIF, and WebP images and works on desktop and mobile browsers.
