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refrf.dev
An experimental, largely visual and example-based open source online book about regular expressions. It is intended for regex beginners with some programming experience and covers basics such as character classes, escapes, groups, repetition, alternation, flags, anchors and lookaround. A single-page version is available for printing.
regexlearn.com
RegexLearn provides developer documentation, references, tutorials, or learning resources.
regexone.com
RegexOne provides a set of interactive lessons and exercises to help you learn regular expressions. The lessons cover topics such as matching specific characters, character ranges, optional characters, whitespace and groups, and the site also includes practice problems and language guides.
rela.dev
RelaGit is a graphical Git client built with SolidJS and Electron, available for Windows, macOS, and Linux. It provides extensible workflow and theme APIs for managing source code, and integrates with GitHub, GitLab, and Codeberg. Downloads are labeled Beta, and macOS 10.14 or later is required.
remarkbox.com
Remarkbox is an open source comment system built to engage readers with content. It is a hosted comments service that embeds in pages, without ads or tracking, and offers Markdown and syntax highlighted code blocks.
remotion.dev
Remotion is a tool for creating videos and motion graphics with React. It supports using coding agents, bulk rendering, server-side and client-side rendering, and building applications such as a player or editor starter. A free license covers individuals and companies of up to 3 people. System requirements include Node 16 or Bun 1.0.3, with macOS 15 or later required.
remotly.com
Remotly is remote desktop software for connecting to computers, with encoding, encryption and access control features. The site lists Pro, Admin, Support and Ultra-High Quality plans alongside a free option, with prices per user per month.
renderforest.com
Renderforest is an AI-powered creative platform for making videos, designs, and websites. It offers AI video, image, and audio generation, over 1200 video templates, an AI video editor, AI website builder, and logo generator. The pricing page lists Lite, Pro, and Business plans, with a free plan available.
reocities.xyz
Reocities is a free host for hand-made websites, offering a subdomain, a file manager, a visual builder and optional tooling. Sites are static, serving HTML, CSS, JavaScript, images, audio and video as uploaded files. It also provides an HTTP API, an MCP server and optional custom domains and visitor translation.
repec.org
RePEc (Research Papers in Economics) is a crowd-sourced initiative that indexes economics research, including working papers, journal articles, and software code. It aggregates machine-readable metadata contributed by thousands of publishers and archives, and provides free public services for readers, authors, and institutions to access, browse, and disseminate research.
replay.io
Replay QA is an autonomous testing harness for web applications. Agents explore an app, write and run tests in a Chromium browser, and record deterministic runtime sessions. It reports bugs such as runtime bugs, UI glitches, accessibility issues, performance problems and security vulnerabilities, with a root cause and suggested fix. Reports go to GitHub, Linear, Jira or other HTTP endpoints.
github.com
RepoHub is a cross-platform package manager that provides a unified interface for package discovery and installation across different operating systems. It works on Linux, Windows and macOS and accesses software from official repositories. It offers package icons, generates idempotent installation scripts for a selected platform, and supports smart filtering for browsing packages.
repology.org
Repology is a service that monitors package repositories and other sources, comparing package versions across them. It shows in which repositories a project is packaged, which version is the latest, which needs updating and who maintains the package. It is aimed at package maintainers, software authors and users, and offers an API.
codefinder.org
Reposearch helps search source code, repositories, APIs, and developer resources.
repth.neocities.org
A page of responsive static website themes coded by the author and split into static and responsive categories. Visitors may use the themes for their own sites, with the request that credit be left somewhere on the page.
codeberg.org
A Codeberg repository for requesting project resources such as CI access, more repositories and storage. It hosts request templates and notes default limits set to prevent abuse. Hosted CI/CD runs in containers on GNU/Linux platforms, Forgejo Actions default runners need no permission, and Woodpecker CI access is granted per account via a request form.
hzdr.de
RES³T is a digitized thermodynamic sorption database implemented as a relational database. It is mineral-specific, allowing use with additive models of more complex solid phases such as rocks or soils. An integrated user interface lets users access selected mineral and sorption data, extract internally consistent data sets for sorption modeling, and export them in formats for other modeling software.
rescuetime.com
RescueTime is automatic time tracking software combining RescueTime Focus, which tracks time on apps and websites, sets goals and blocks distractions, with RescueTime Timesheets, which logs time by client, project or task and generates timesheets and reports. Solo and team features are offered.
resend.com
Resend is an email platform for developers. It provides an interface for sending transactional and marketing emails, with SDKs for programming languages. Features include modular webhooks for delivery, open, bounce and click notifications, a test mode, contact management, broadcast analytics, and email development using React.
reshade.me
ReShade is a generic post-processing injector for games and video software developed by crosire. It provides an automated way to access frame color and depth information, with depth automatically disabled during multiplayer. The tool supports Direct3D 9, 10, 11 and 12, OpenGL and Vulkan, and includes its own shading language and compiler called ReShade FX.
responsively.app
Responsively is a free and open source developer tool for responsive web development. It shows all devices side by side, replicates clicks, scrolls, and navigation across devices in real time, supports saving device combinations as Preview Suits, and includes a unified inspector and one-click screenshots.
responsivetesttool.com
ResponsiveTestTool is a free web tool for previewing any website across mobile, tablet, desktop and TV screen sizes. Users paste a URL to see how the site renders on different devices without signing up.
virejdasani.github.io
Responsivize is an open-source, cross-platform desktop app for developing responsive websites. It lets users test web apps on popular devices or custom dimensions and includes device frames, browser menubars and search bars. The app works on Windows, MacOS and Linux and is free to use.