Open Source

RFM Radio - real radio (not online, not require Internet), that uses real hardware radio for Android smartphones based on Qualcomm Snapdragon processors.NB: Application requires root.Currently supported ONLY smartphones with Qualcomm Snapdragon (except >=632 and >=820). Supported models see here.Note: though the app itself is covered by the GPL, there are 3 Qualcomm files (native platform specific routines to program the V4L2 driver for FM) used which are not.Capabilities:Listening to the radio.Reading RDS - PS and RT.Display the signal strength in dB.Radio recording in .wav and .mp3 files.Saving favorite frequencies with name.Ability to create multiple favorites lists.Automatic search for radio stations.

Simple and fast tool to get RGB channel and HEX values about a color. RGB Tool lets you find out all the colors you need in a very simple and quick way. It features RGB and HSB color models plus color transparency and it displays HEX value. You can take a picture with the camera or open an image stored on your device to get color information. It is also possible to extract image palette data of a picture. Save your preferred colors, so you can easily pick them later or whenever you need. When you have found your color, you can also print it in a PDF document or using a printer.

RHVoice is a free and open source speech synthesizer. Voices are built from recordings of natural speech. They have small footprints, because only statistical models are stored on users' computers. And though the voices lack the naturalness of the synthesizers which generate speech by combining segments of the recordings themselves, they are still very intelligible and resemble the speakers who recorded the source material. Supported languages: Initially, RHVoice could speak only Russian. Now it also supports American English, Brazilian Portuguese, Esperanto, Georgian, Ukrainian, Kyrgyz and Tatar. In theory, it is possible to implement support for other languages, if all the necessary resources can be found or created.

RHVoice is a free and open source speech synthesizer. Voices are built from recordings of natural speech. They have small footprints, because it's only statistical models. Although the voices lack the naturalness, which is typical for synthesizers which generates speech by combining segments of the recordings themselves. But they are still very intelligible and resemble the speakers whose voices were recorded. Supported languages: Albanian (gjuha shqipe) Belarusian (беларуская мова) Croatian (hrvatski jezik) Czech (český jazyk, čeština) English Esperanto Georgian (ქართულიо) Kyrgyz (кыргыз тили, кыргызча) Macedonian (македонски јазик) Nepali (नेपाली) Polish (język polski, polszczyzna) Portuguese Brazil (português do Brasil, brasileiro) Romanian (limba română) Russian (русский язык) Serbian (српски језик, srpski jezik) Setswana Slovak (slovenský jazyk, slovenčina, slovenská reč) Southern Vietnamese (tiếng Việt) Spanish (español) Tatar (татар теле, татарча) Turkmen (türkmen dili, türkmençe) Ukrainian (українська мова) Uzbek (Оʻzbek tili, oʻzbekcha, Ўзбек тили, ўзбекча)

NFC reader for public travelcards in Sweden and Denmark. It supports reading cards following the RKF standards and is tested with cards from the following providers: * Skånetrafiken JOJO * Länstrafiken kronoberg * Norrbotten * SL * Västtrafiken * Rejsekort A/S Note that your NFC device must support reading Mifare classic cards, which is unfortunately not possible on several handsets.

RKNHardering is an Android application that detects VPN and proxy usage on a device, implementing the Russian Federal Service for Supervision of Communications (RKN) methodology for identifying circumvention tools. The app runs nine independent detection modules in parallel and produces a combined verdict: - GeoIP — checks the public IP against GeoIP databases and hosting/proxy signal providers - IP Comparison — compares responses from RU and non-RU public IP checkers - Direct Signs — inspects NetworkCapabilities, system proxy settings, and installed VPN apps - Indirect Signs — analyzes network interfaces, routing table, DNS, dumpsys VPN output, and localhost proxy listeners - Location Signals — reads MCC/SIM/cell/Wi-Fi data and queries BeaconDB for geolocation - Bypass Check — scans localhost for open SOCKS5/HTTP proxies, Xray gRPC API endpoints, and detects underlying network leaks - CDN Pulling — sends HTTPS requests to trace endpoints to determine the apparent public IP - Call Transport — checks STUN and MTProto availability to detect traffic tunneling - Native Signs — performs JNI-level checks of interfaces, routes, /proc/self/maps hook markers, and root indicators The final verdict (NOT DETECTED / NEEDS REVIEW / DETECTED) is calculated by VerdictEngine using a weighted combination of the module results. Minimum Android version: 8.0 (API 26). Source code: https://github.com/xtclovver/RKNHardering

Encode/decode text using the simple ROT13 substitution cipher. ROT13 is a means of hiding text from a casual glance, comparable to a magazine printing the solution to a quiz upside down.

RPClient is a local-first AI role-playing chat client for Android. It helps you manage character cards, lorebooks, one-on-one chats, group chats, prompt presets, summary memory, and regex scripts directly on your device. Chat histories, characters, lorebooks, and app settings are stored locally by default. RPClient does not provide model services. You choose and configure your own model provider, including OpenAI-compatible APIs, Gemini, Anthropic Messages, DeepSeek, OpenRouter, or a custom endpoint. Model requests are sent directly to the provider configured by you. Features include: - Character Card V1/V2 JSON and PNG import - Character Card V2 JSON and PNG export - SillyTavern-style lorebook import and export - One-on-one and multi-character group chats - Streaming responses, regeneration, continuation, and impersonation - Long-term summary memory - Prompt presets, macro expansion, prompt inspection, and token budgeting - Global, preset, and character-scoped regex scripts - Local request log debugging mode - Material 3 UI with multiple interface languages The project is under active development. Back up important cards, lorebooks, and chats before upgrading.

Very handy calculator, in Reverse Polish Notation style. Written in Kotlin. For every day use. Large digits with only the most used operators.

A simple, modern RPN calculator that uses RPN. Reverse Polish Notation is a system where the operators are entered _after_ the operands. For example, rather than 2 + 2, you would enter: 2 2 + The main benefit is a faster, more accurate interface.

Note: this app seems to be no longer maintained. RPi Camera Viewer plays a raw H.264 video stream from a Raspberry Pi camera.In a nutshell, when you start the program it scans the local network for cameras and shows you the resulting list. Tapping on one of the camera names displays the video from that camera.

RSAF is an Android document provider for the wonderful rclone. It allows any app that supports Android's Storage Access Framework (SAF) to access remote files via rclone's backends. RSAF is not itself a file manager, but any file manager supporting SAF, including the one built into Android (Settings -> Storage -> Documents), can make use of it.

RSS Reader is a compact, classic RSS reader for Android. The app collects RSS and Atom feeds in one place and displays new articles in a clear, compact list view. New entries are stored locally and can be read directly in the integrated reader view or opened in the browser. Features: - Subscribe to RSS and Atom feeds - Import and export OPML files - Mark articles as read or unread - Protect favorites from deletion - Light and dark mode - Background updates with notifications - Compact reader view with images and swipe navigation The app is designed for simple, fast, and organized feed management.

RSSAid is a client app for RSSHub. RSSHub is an open source project to generate RSS links for websites that don't support rss, then you can use the rss link in your own RSS reader to subscribe. You can deloy the RSSHub service on your own server or use the free service provided by the project author. What RSSAid does is simple: it is just a tool not a RSS reader, you input a link like https://www.reddit.com/r/Fedora/, then RSSAid can generate the RSS link according to RSSHub rules and base url (RSSHub service hostname).

RTSP IP-Cam Viewer is an Android app to watch RTSP video streams; this format is typical of inexpensive IP security cams.Goals:an extremely light-weight open-source app with minimal features and minimal UIability to add video streams (including via import of JSON text files)display of enabled video streams in list- and grid-view, full-screen view of a single high-res video streamNotes:this app does not require the latest Android versions, so your old device can be put to a new purpose with thiswhen videos are displayed in list/grid views: audio is mute; click to open video in full-screen view; long click to toggle pause/playwhen a video is displayed in full-screen view: audio is not mute; controls are visible

This app is a recursive version of the popular game Tic-Tac-Toe (also known as Xs and Os), based on the Ultimate Tic-Tac-Toe game. The game supports customization of the playing field (width and height), the victory condition, the number of players, and player colors.

RUTEdu is an interactive educational app for high school students, developed at PRZ (Rzeszów University of Technology). Features: * Math lessons: algebra, equations, fractions, percentages, geometry, statistics * Interactive periodic table of all 118 elements * Chemistry quizzes with automatic question generator * Chemical equation balancing with number keypad * Geography quiz with interactive map (click-a-country) * Duel: two-player battle on one phone, works with every lesson * Progress tracking and per-subject question configuration * 29 European languages, light and dark theme No ads, no tracking, no internet required (except map quiz).

RUTMath is an interactive educational app that helps school-aged children learn math. The application offers many different levels of difficulty to adjust to the user's skill level, and provides exercises and games that help with learning basic math operations such as addition, subtraction, multiplication, and division. Additionally, the application allows to learn how to convert units, such as converting meters to centimeters, kilograms to grams, etc. There is also the possibility of learning multiplication tables and divisibility of numbers, which are very important for further mathematical education. Thus, the application is an excellent tool for teachers and parents who want to help children learn math in a fun and effective way.

RaagaDB app is meant to be comprehensive database for Carnatic Raagas. Melakartha and Janya raagas are included. UMID16 (Unique Mela ID 16 Swaras) is a new concept. The ID is automatically created from the Swaras of the Mela Raaga by assigning bit to 16 Swaras. That is, 1 for each Swaras and 0 for absent Swaras. UMID12 is a variant for 12 Swara system used in Hindusthani sysytem.

Hundreds of levels of puzzling action! * Help your rabbits find their way from the entrance to the exit. * If you rescue enough rabbits, you can go on to the next level. * Control your rabbits by dropping tokens that give them special abilities. * Choose abilities like bridge-building, climbing and digging. * Make your own levels.

Raccoon is a social app designed to bring Friendica and Mastodon to you in a completely new way. Main features: • "tour" mode: explore the Fediverse without creating an account • view multiple timelines (local, federated, followed, custom lists) • traditional navigation (vertically scroll the message timeline) • simplified navigation (horizontally swipe between posts) • support for long posts, formatting, titles and spoilers • formatting toolbar and message preview • smart insertion of alt-text for attachments • intuitive topic view for ActivityPub groups (Friendica, Lemmy, Gup.pe) • view post details • direct messages • multimedia gallery • circle and list management • social view of blog RSS feeds • integrated event calendar • UI customization (colors, font size, post length, "distraction-free" mode, etc.) • save drafts or schedule message publishing • multi-account • explore in "guest mode": view public timelines of other servers • settings import/export • 100% compatible with Mastodon and Mastodon Glitch-Soc version (long and formatted posts) Friendica is a social environment integrated in the Fediverse, just like Mastodon and Pixelfed, which is also compatible with Bluesky and Tumblr. Raccoon intends to make it easier to use Friendica and integrates the features of its web interface in an intuitive and lean view. Additional features: • view trending posts, hashtags and follow suggestions • manage follow requests • create post and user reports to moderators • mute/block users, set custom rate limits and exclude terms from your timelines • polls (read-only on Friendica) • profile editing • edit and delete your posts • translate posts to your language • and, of course, much more!

Raccoon for Lemmy is fully open source, and intends to offer an ad-free and as functional as possible experience on Lemmy. In this app everyone should feel at home, so great importance is given to localization and customization of the UI. Main Features: view post feed and comments with different listing and sort types; possibility to upvote and downvote (with configurable swipe actions); community and user detail (with info about moderators/moderated communities); user profile with one's own posts, comments and saved items; inbox with replies, mentions and direct messages; global search with different result types (all, posts, comments, user, communities); create and edit new posts (with optional images); cross-post contents to other communities; reply to post and comments (and edit replies); mark posts as read (even while scrolling) and hide read contents; custom appearance (color scheme, fonts, text sizes, post layout, etc.); custom localization (independent of system settings); block users, communities and instances; report post and comments to moderators; support for multiple accounts with account-specific settings; lazy scrolling (referred to as "zombie mode"); explore all the communities on a given instance in guest mode; multi-community (community aggregation); view the moderation log; community moderation tool (examine and resolve reports, ban users, feature posts in community, block further comments from posts, mark comments as distinguished, remove posts/comments, review all created posts/comments, edit/create community) save drafts for posts and comments anonymous mode with quick instance switch admin tools (purge users/posts/comments/communities, feature posts locally, hide/unhide communities)

Ghosting is an established training exercise in racket sports to practice court movement without a ball. Moving to the various corners of the court improves both footwork and general stamina. In the best of worlds, your coach or sparring partner will always be ready to point you to random corners at a pace that pushes you to your limits. Unfortunately, few people have access to a coach at all times, thus have to run the exercise on their own. That means the randomness in the order of corners is missing. Getting Started 1. Configure your ghosting session. 2. Put your mobile device in front of you on the court. 3. Press "GO!" to start your ghosting session.

Radar App allows you to navigate through alternative and radical events in your location. Events are loaded from https://radar.squat.net App allows getting the list of events with distance to their locations and adding them to your calendar, viewing location or sharing with friends.