explorer.onino.io
Block explorer for ONINO Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
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explorer.ont.io
Block explorer for Ontology Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
mainnet-scan.oortech.com
Block explorer for Oort Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
optimism.blockscout.com
Block explorer for OP Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
open-science.ub.ovgu.de
Open Science OVGU is the former open access repository for research data and publications of Otto-von-Guericke University Magdeburg (OVGU). It is no longer actively maintained, and users are advised not to enter OVGU login details on the site. The repository hosts communities for research data and open educational resources, and includes recent submissions such as the 2024 TapCorder Data Set, which explores classification of oily or cream-like substances using smartphone-captured diffraction data.
opendemocracy.net
openDemocracy is an independent international media organisation headquartered in London, producing investigative and movement-focused journalism in English and Spanish on gender, geopolitics, migration, technology and rights. It publishes news, analysis and podcasts, reaching activists, policymakers, academics and civic leaders through its digital platforms and newsletters.
ogpuscan.io
Block explorer for OpenGPU Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
openhab.org
openHAB is a vendor- and technology-agnostic open source automation software for the home, developed in Java on Apache Karaf. Its pluggable architecture supports over 400 technologies and thousands of devices, with rules driven by time, events, scripts, actions, notifications and voice control. It runs on Linux, macOS, Windows, Raspberry Pi, Docker and Synology, and is accessed through web, iOS and Android apps. It runs on local hardware without requiring cloud services.
scan.openledger.xyz
Block explorer for OpenLedger Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
openmusictheory.github.io
Open Music Theory is an open-source, interactive online textbook for college-level music theory courses. It was built on resources authored by Kris Shaffer, Bryn Hughes, and Brian Moseley, edited by Shaffer and Robin Wharton, and published by Hybrid Pedagogy Publishing. It is intended to support active student engagement in the theory classroom and is designed for inverted or flipped courses.
openpanel.com
OpenPanel is a multi-user web hosting control panel built around lightweight containers. Each user gets an isolated environment with a separate MySQL server, PHP version, Redis instance and root access. Administrators and resellers manage servers through the OpenAdmin panel, and the OpenPanel interface lets clients manage domains, websites, services and email. OpenCLI provides terminal commands for panel actions.
openpgp.org
A page listing email applications across Windows, macOS, Android, iOS, Linux, browser plugins and webmail providers that support the OpenPGP standard, either directly or with additional software. The page states that its authors do not actively participate in developing these third-party apps and have not performed security audits.
bellyscan.com
Block explorer for Openpiece Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
github.com
OpenRabbit is a free, open-source, self-hosted GitHub pull request reviewer. It analyzes PR diffs, consults a pluggable LLM provider such as Groq or OpenRouter, and posts a summary with inline comments. It runs entirely in GitHub Actions, so no server or hosting subscription is required, and code stays in the user's runner.
github.com
An open-source tool that captures digital history through regularly taken screenshots. Text and images in the screenshots are analyzed and made searchable, and users can scroll back through past activities. It is described as cross-platform.
opentunnel.net
OpenTunnel is a free tunneling service offering SSH, V2Ray, XRay, OpenVPN, WireGuard and other accounts. The site states that accounts are free, servers offer unlimited bandwidth and are online 24 hours, and no logs are used to monitor activity. It lists total server counts per protocol.
roadtolarissa.com
Oracle is an interactive web program that analyzes patterns in a user's left and right arrow key inputs to predict their next keystroke. It is typically correct around 70% of the time, as humans struggle to act randomly. The program records each keystroke, compares the frequency of subsequent left or right inputs after matching four-keystroke sequences, and guesses the more common outcome. A similar approach can be applied to Rock-Paper-Scissors.
explorer.orderly.network
Block explorer for Orderly Mainnet, showing transactions, blocks, addresses, tokens, and network activity.
osint.support
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.
otter.ai
Otter AI Meeting Agent supports real-time transcription, live chat, automated summaries, insights, and action items.
torontohydro.com
Toronto Hydro outage map for checking active power outages and service restoration information.
objective-see.org
OverSight is a macOS tool that monitors a Mac's microphone and webcam, alerting the user whenever either is activated or deactivated. It requires macOS 12 or later and administrative privileges to install and run. The project is open source and can alert even when the system is already infected, though in some cases it cannot identify the responsible process.
garykessler.net
A free, evolving tutorial on cryptography maintained since 1999. It covers basic cryptographic concepts, types of algorithms including secret key, public key and hash functions, trust models, and applied algorithms in action.
palettescan.com
Block explorer for Palette Chain Mainnet, showing transactions, blocks, addresses, tokens, and network activity.