Ray Optics Simulation is a web-based tool for creating and simulating 2D geometric optical scenes interactively. It provides components such as single rays, beams, mirrors, glass, ideal lenses, diffraction gratings, detectors and a ruler, with views for rays, extended rays, images and colors. Source code is available on GitHub.
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The Roller Coaster DataBase is an interactive database offering statistics on roller coasters, including the fastest, tallest and longest. The site also lists new additions, videos and reports, with sections such as record holders, world view and inversions.
RDX for Reddit is a mobile web viewer for Reddit described as inspired by the closed Apollo app. It offers a mobile-friendly reader with multiple dark and light themes and browsing without ads, along with settings and the ability to subscribe to subreddits. Apps for iPhone and Android are offered for download.
Reader Mode is a distraction-free reader that turns webpages into a simpler reading view with adjustable fonts, text size, spacing, colours and contrast. It includes reading rulers, text-to-speech, a Pomodoro timer, Bionic Reading and a highlighter. Version 2.0 is available as a Chrome extension; version 3.0 is in development.
RealFights collects completed matches, event replays, and sports highlights for on-demand viewing.
Receive SMS Online provides virtual phone numbers in countries including the United States, United Kingdom, Sweden and Canada. Users select a country and a number to view SMS messages received by that number. The site lists amounts and active status for numbers per country.
Reddit Enhancement Suite (RES) is a community-driven unofficial browser extension for enhancing the reddit experience. It has entered maintenance only mode. Features include an account switcher, comment navigation, filtering of NSFW content and links, inline image viewing, keyboard navigation, and a never ending stream of content.
Reddit Stream provides a live-updating view of Reddit comment threads. Replacing reddit.com with reddit-stream.com on any thread shows the newest comments, and a bookmarklet can be dragged to the toolbar for use while viewing a reddit thread.
Reddit link is a social media utility for platform customization, archives, embeds, or community tools.
Reddit profile analysis tool for viewing account activity, comments, posts, and subreddit patterns.
Movie and television guide from ReelScary, covering programmes, credits, discovery, and viewing references.
Total Registry is a replacement for the Windows built-in Regedit.exe tool. It displays the real Registry rather than only the standard one, sorts list views by any column, shows key icons for hives, inaccessible keys and links, and includes a full search, an enhanced hex editor for binary values, undo/redo and copy/paste of keys and values.
HNRelevant is a browser extension that adds a sidebar showing related submissions to the Hacker News item being viewed. It is also available as a UserScript for Greasemonkey and Tampermonkey, and the query can be customized when title-based results are not relevant enough.
Film and television guide from Releases.com, covering programme details and related viewing information.
Archive-style tool for viewing removed Reddit posts and deleted comments when available.
Rephonic offers an interactive 3D audience graph for finding similar podcasts. It visualizes connections between podcasts drawn from Apple Podcasts' "Listeners Also Subscribed To" data, showing a show's neighbours and its neighbours' neighbours. The page notes it is best viewed on a desktop or tablet device.
Digital repository of the Jan Kochanowski University holding 269 digital objects across collections covering research data, humanities, medical and health sciences, social sciences, science and natural sciences, and art sciences. It offers advanced search and recently added and most viewed object listings.
The University of Essex Research Data Repository is for publishing, discovering and disseminating research data created by University researchers. It supports browsing research outputs by author or department, searching the repository, viewing latest additions and top authors and downloads, and depositing new datasets.
The Research Data Leeds Repository is the University of Leeds' institutional research data repository. It allows users to search for and browse research data outputs, view recently added items, and access information about research data management and repository policies. The repository supports OAI 2.0 and is powered by the EPrints platform.
RetroFab is an online collection of vintage handheld electronic game simulations playable in the browser. Each simulation includes a 3D simulation of the original device, rotatable 3D views of packaging, and browsable scans of instruction guides. The first simulations are released in early access, and simulations are also downloadable.
This is a Hugging Face Space created by AllenAI that hosts an interactive RewardBench leaderboard. Users can filter the leaderboard by model name pattern or model type to view scores for each model across RewardBench evaluation categories, and can download the full evaluation results.
RiffTrax's Twitch channel for live comedy-commentary streams, community viewing, and chat.
RimSort is a free and open source, multi-platform mod manager for the video game RimWorld, supporting Windows, macOS, and Linux. It automatically sorts mod lists using rules derived from mod data, community-submitted rules, and Steam data, and provides a live view of warnings and errors such as missing dependencies and load order violations. It is distributed under a GPL-3.0 license.
Rolisteam is a free and open source virtual table for TTRPG sessions. It includes features such as BattleMap messaging, mind maps, character sheets, a music system, a PDF viewer and dice. Downloads are offered for Windows, Linux and Mac, with Linux also available via Ubuntu PPA and Flathub.