resttesttest.com
A simple web page for testing APIs. Users specify an HTTP method, URL and parameters and click to send an Ajax request. The page requires a browser with HTML5 support.
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nmap.org
Ndiff is a tool that compares Nmap scans. It takes two Nmap XML output files and prints the differences between them, such as hosts coming up and down and ports becoming open or closed. It can produce human-readable text or machine-readable XML output and is used by the Zenmap GUI to compare scan results.
retype.com
Retype is a Markdown-first documentation website builder that turns Markdown files into a website. It installs via npm, Yarn, or the dotnet CLI, and running retype start builds the site and opens it in the browser. Retype Pro and Enterprise licenses unlock Pro features; the Free plan lists three projects. Sites can be hosted on any web server or on GitHub Pages, Netlify, or Cloudflare.
revanced.app
ReVanced Manager is a software project that continues the legacy of the discontinued Vanced service. It allows users to apply patches to Android applications to customize their mobile experience. The project’s patching system is designed to remain compatible with new versions of target apps with minimal maintenance, and it provides download access, contributor information, and donation channels.
reverseengineering.vercel.app
A site offering lessons on the fundamentals of reverse engineering, binary analysis and software security. It describes hands-on tutorials, practical examples and real-world scenarios covering binary analysis, malware research, and static and dynamic analysis.
mohitmishra786.github.io
ReversingBits helps developers write, search, review, test, or manage code and projects.
roomeqwizard.com
REW is free software for room acoustic measurement, loudspeaker measurement and audio device measurement, with measurement and analysis tools. A Pro upgrade offers simultaneous measurement of multiple inputs with rms averaging, adjustable weighting for each input, level alignment, and up to 16 input traces on the RTA.
rhasspy.readthedocs.io
Rhasspy is an open source, fully offline set of voice assistant services for many human languages. It works with Hermes protocol compatible services, Home Assistant, Hass.io, Node-RED, Jeedom and OpenHAB. Voice commands are specified in a template language and produce JSON events that can trigger actions in home automation software. A web interface allows configuration, programming and testing, with functionality exposed through an HTTP API.
ricochetrefresh.net
Ricochet Refresh is an open-source project to allow private and anonymous instant messaging. It is a peer-to-peer messenger app that uses Tor to connect clients, creating a Tor hidden service on the computer. The project updates the original Ricochet software and is compatible with Tor Onion Services v3.
rip.so
rip.so is a memorial site listing messengers, social networks, browsers, gadgets and websites the internet forgot, organized into categories such as messengers and chat, social networks, software and apps, streaming and video, and search engines and browsers. The page is marked as under construction.
pad.riseup.net
Riseup Pad is an Etherpad service hosted by Riseup. Etherpad is a software libre web application that allows for real-time group collaboration of text documents. Users create a pad with a name and set its lifespan. Riseup states that it does not store IP addresses, requires https, and automatically destroys pads after 60 days of inactivity.
rizin.re
Rizin is a free and Open Source Reverse Engineering Framework. It uses a shell-like command-line environment for analyzing binaries, with automatic signature detection to match unnamed functions against FLIRT signatures. Projects for saving and loading Rizin sessions are in beta, and Cutter is Rizin's official graphical user interface. A package manager for downloading, compiling and installing plugins is still in early development.
rizon.net
Rizon is an IRC network that offers a free service for setting up a channel to chat with friends or coordinate with a group. It provides nickname and channel registration, built-in entertainment commands, and a webchat page, and users can also connect with their own client.
watzlavick.com
A project for an amateur-built liquid fueled rocket engine and flight vehicle, with a site covering engine designs, igniters, a rocket, test stand and software. A launch of Rocket 1 reached 10,800 ft after about 10.5 seconds of engine run time.
rodare.hzdr.de
RODARE is the Rossendorf Data Repository, a publication repository for research data and software from HZDR. Its listings include datasets and code associated with manuscripts, such as experimental AFM data, simulation codes and DFT data, uploaded with version numbers and open access.
ropemporium.com
ROP Emporium teaches return-oriented programming through a series of challenges, starting with ret2win and progressing through topics such as split, callme, write4, badchars, fluff, pivot and ret2csu. A beginners' guide is available.
rosebud.ai
Rosebud AI is a game maker for creating playable games from AI prompts. Users describe an idea or choose a template, then build and deploy the game, with no coding required. The pricing page says a free start is followed by upgrades for more credits, private projects, commercial rights, code download and Windows export.
roslynpad.net
RoslynPad is a cross-platform C# code editor and runner built with Roslyn, available for Windows, macOS, and Linux. It offers code completion, quick info, signature help, diagnostics, code fixes, real-time execution, NuGet package management, and document management.
roslynquoter.azurewebsites.net
Roslyn Quoter is a browser-based tool that parses C# code and generates Roslyn syntax factory calls. It offers options for parse type, parenthesis placement, whitespace preservation, redundant API calls, and ready-to-run output with compilation and diagnostics. The project is open-source on GitHub.
roundcube.net
Roundcube is free and open source webmail software written in PHP. It is a browser-based multilingual IMAP client with a desktop-like interface offering drag-and-drop message management, MIME and HTML support, address book with groups and LDAP connectors, threaded message listing, spell checking, shared IMAP folders and a plugin API. It supports PGP encryption and is released under the GNU General Public License version 3 or later.
rssowl.org
RSSOwl is a free, cross-platform application for reading, organizing, and searching RSS, RDF, and Atom news feeds. It provides capabilities including automated news filtering based on custom conditions, instant search, saved searches, news notifications, bins for storing relevant entries, and keyword labels for feed items. The software is available for Windows, Mac OS X, and Linux, and requires the Java Runtime Environment to operate.
rtech.support
Rtech, also known as the rTS Wiki, is the official community-built documentation site for the r/Techsupport subreddit. It hosts guides on Windows and Linux installation, hardware maintenance, common troubleshooting issues, and recommended software lists, along with tools for gathering Windows system information and parsing BSOD dump files.
rtutor.ai
RTutor is a website and open-source project for analyzing data; users upload data, ask questions, and receive results in seconds. The site states that the RTutor website and source code are free for non-profit organizations only, with licensing required for commercial use. It also notes an 8-minute YouTube video for first-time users.
kekuwi.github.io
Runa's Archive is a collection of free-to-use VTuber assets, tools, software and tutorials gathered in one place. It groups resources by category, including 2D and 3D assets and backgrounds; both those sections are marked work in progress.