restic is a backup program that backs up files from Linux, BSD, Mac and Windows to self-hosted and online storage. It is a single executable that runs without a server or complex setup, transfers only changed parts of files, uses cryptography throughout, and is free and open source.
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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.
Resuminator is a resume builder for creating single-page resumes. It offers drag-and-drop layouts, one- or two-column toggles, enhanced design controls, customizable sections, multiple resumes, a rich text editor and social links. All features are stated to be free, and the project is open-source.
RethinkDNS is a private DNS resolver with custom rules, blocklists and analytics, and RethinkDNS + Firewall is a companion Android app. Features include an Android firewall that blocks apps from connecting to the Internet, DNS-layer content blocking of ads and trackers, and anti-censorship through encrypted DNS requests. It is free and open source.
Search history data collections and supporting datasets from ESP.
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.
Reverse Dictionary is a search tool that finds words matching a definition or description. It indexes millions of dictionary definitions from the open-source WordNet database. Users can click words in results to see their definitions.
Revive Joint Operations is a fan-powered revival of the classic FPS Joint Operations: Typhoon Rising, featuring the JO:TAC expansion. It offers a launcher, automatic stats, Discord integration, global leaderboards and downloadable game files, and hosts community tournaments. A proximity voice chat feature is announced to launch with the January 2026 opening event.
rfc.fyi is a search tool designed for fast searching of the RFC Series. It supports searches by titles, keywords, and full text, includes options to display obsolete and historic RFCs, and allows filtering results by collection, stream, level, or working group.
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.
Research data portal for exploring basic in biology and medicine records, including genomic data.
Research data portal for exploring engineering records, including experimental data.
Rhythm is an Android music player featuring Material You design. It uses Media3 ExoPlayer and includes a 10-band equalizer, synchronized lyrics, library management, and device switching. A Dual-Mode Architecture supports local and streaming playback. It is available on Google Play for open testing.
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.
Research data portal for exploring history records, including survey data.
RIKEN Bioresource Research Center is a leading life science research infrastructure center. It preserves and distributes bioresources including mouse strains, plant cell lines, DNA materials, microbial strains, and fluorescent proteins, and provides search tools, big data analysis, and information services to support scientific research.
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.
Find and access engineering research data, with indexed image.
Riseupnet is a code project with source, releases, documentation, or setup notes.
Risklayer Explorer presents global risk, resilience and disaster analytics in cooperation with the Risk & Resilience Observatory. It offers sub-national and national risk and resilience profiles and analytics, and a Disaster Event Observatory providing near-realtime disaster impact data and analytics alongside an event archive.
Dataset repository covering engineering, with searchable datasets.
Browse research datasets and datasets related to engineering.
Find and access agriculture, forestry and veterinary medicine research data, with indexed datasets.
Research data portal for exploring atmospheric records, including geospatial data.