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Optunity is a Python library containing various optimizers for hyperparameter tuning. It provides several approaches to solving tuning problems, including cross-validation facilities and score functions. The documentation states it is supported in R, MATLAB, GNU Octave and Java through Jython, and is free software under a BSD-style license.
Orange is an open-source machine learning and data visualization toolbox. It offers visual programming in which widgets are placed on a canvas and connected to load datasets and analyze data. It supports interactive visualization methods including box plots, scatter plots, decision trees, hierarchical clustering, heatmaps, MDS, t-SNE and linear projections. Extensions add text mining, network analysis and other specialized capabilities.
Orbat Mapper helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
Orbot is a Tor VPN for Android and iOS that routes app traffic through the Tor network. It lets Android users choose which apps route through Tor and allows apps to connect to onion services. It offers access to Tor Bridges for restricted networks. The project is free and open source, with code that anyone may inspect.
OrcaSlicer is a free, open-source 3D printing slicer for FDM 3D printers, created by SoftFever. It runs on Windows, macOS, and Linux and is licensed under AGPL-3.0. The slicer includes a built-in calibration suite and per-feature control over print settings, with tuned profiles for printers from Bambu Lab, Prusa, Creality, Voron, and others. Network printing supports Klipper, PrusaLink, and OctoPrint.
OrganicChemistryData.org is an encyclopedic collection of information, data, resources and links for organic chemists, curated by the ACS Division of Organic Chemistry. It covers reaction information, chemical data, spectroscopy resources, organic compound information, safety resources, literature sources, laboratory techniques and software.
The official Organic Maps Telegram group covers Organic Maps, described as open-source, privacy-friendly, fast and detailed offline maps for iOS and Android. The group also links to ways of supporting the app's development and to a channel for Russian speakers.
Organicmaps is a miscellaneous web resource for discovery, directories, archives, web culture, or useful tools.
Organize is a system utility for Windows, hardware checks, cleanup, process control, or desktop customization.
Orkas is an open-source, local-first AI desktop app. A commander LLM directs specialist sub-agents and runs installed coding CLIs including Claude Code, Codex, OpenCode, OpenClaw, and Hermes as local sessions. Its agents self-evolve via reflection and skill crystallization, supports bring-your-own keys, and is compatible with macOS, Windows, and Linux.
An open-source model registry that uses an image registry to distribute machine learning models. Users upload and download models with ormb pull and ormb push, and describe model information in ormbfile.yaml, similar to a Dockerfile.
OSDev Wiki helps explore knowledge, places, timelines, entities, or reference information from open sources.
A Chrome extension that combines several OSINT and SOCMINT tools into one package, with added support for Instagram, Twitter and TikTok. Users need an account on each platform and must have the site open with a logged-in session in the active tab. The source code is obfuscated, which may trigger antivirus alerts.
Lithuanian OSINT article introducing open-source intelligence concepts, tools, and methods.
OSINT Dorks is a GitHub repository maintained by BushidoUK that collects search operators used in open-source intelligence work. It contains a GoogleDorks.csv file alongside ShodanAdversaryInfa.md and ShodanQueriesAppliances.csv files, covering Google dorks and Shodan queries. The repository is tagged with the topics bugbounty, cybersecurity, google-dorks, osint and shodan. Its about section states that no description or website is provided.
GitHub resource collection organizing OSINT links and public sources by country.
Article explaining OSINT mindset, search habits, source awareness, and investigative thinking.
OSINT Techniques is a blog covering open-source intelligence topics, with sections on forensic OSINT, fictional accounts, books, movies, videos, tools and training. One post from 2021 presents a map tracking lower mainland gang conflict shootings in Metro Vancouver, built from news articles and law enforcement releases.
A page listing third-party links and tools for investigations on websites and domain names. Entries cover WHOIS lookups, DNS history, SSL certificates, subdomain finding, open ports, archived information and source code investigations, with notes on whether a paid account is needed.
Osint Support is a website focused mainly on developing tooling for the OSINT community. It also presents a definition of open source intelligence as the collection and analysis of information gathered from public or open sources.
OsmAnd~ is an open source offline world map application based on OpenStreetMap, available from F-Droid. It offers map viewing, GPS navigation without an internet connection, route planning and GPX track recording. The listing notes anti-features including non-free assets and tracking via an installation ID sent with map download requests.
Osmapp helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
OSMC is a free and open source media center built on Debian Linux and Kodi Media Center. It offers an App Store for customization and plays major media formats from various devices and streaming protocols. Vero V is the project's flagship device, with support for 4K, HDR and HD audio.
ossia score is a free, open-source intermedia sequencer for Windows, macOS and Linux. It sequences audio, video, OSC, MIDI and DMX on an interactive timeline and supports scripting with JavaScript and Faust. It is used for interactive shows, installations and live electronic music.
