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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.
OSSSoftware helps discover software alternatives, open source projects, or replacement apps.
Open Source Society University (OSSU) is an open education initiative that provides free self-taught college-level curricula. It offers structured learning paths for Computer Science, Mathematics, Data Science, and Bioinformatics, plus localized versions for Brazilian and Chinese learners. All resources are freely accessible with no cost to users.
Regional streaming service from OtakuDesu, focused on films, series, and programmes from supported markets.
An ArcGIS Hub open data portal from Ottawa Riverkeeper for discovering, analyzing and downloading data. Data can be downloaded in CSV, KML, Zip, GeoJSON, GeoTIFF or PNG, and API links are provided for GeoServices, WMS and WFS. Analysis is available through charts and thematic maps, with options to create StoryMaps and Web Maps.
OtterSec provides blockchain security audits and research. The firm audits Layer 1 foundations, wallets, DeFi protocols, bridges, and related infrastructure, and publishes past audits, findings, research notes, and team talks.
OTTRun provides white-label OTT apps for Android, Apple TV, iOS and web, along with middleware for IPTV, OTT and hotel providers. It offers the OTR Panel for managing content and customers. Apps are branded as the operator's own and published under the operator's developer account. The official players contain no media content.
Our Vision for the Future of Synthetic Media by Victor Riparbelli Medium provides machine-learning models, research, training resources, or…
Ourbit is a crypto exchange that offers spot and futures trading alongside tokenized stocks, ETFs, commodities, forex and other markets through one app. It reports zero-fee spot trading and futures fees as low as 0.01%, and provides regular 1:1 Proof of Reserves.
OurBoard provides educational videos, lessons, tutorials, or self-learning resources.
Ouroboros Capital helps with crypto security, portfolio tracking, auditing, risk monitoring, or asset protection.
The Outstanding Work by Students project at The Hong Kong Polytechnic University.
Outwrite is an AI writing assistant that checks spelling, grammar and punctuation and suggests style and structural improvements. It works on Google Docs, Microsoft Word, Outlook, Gmail, LinkedIn, WordPress and browser extensions. Available plans are Essential, Pro and Teams.
OverAPI.com is a site that collects all the cheat sheets. It organizes reference sheets for programming languages, frameworks, and developer tools, listing topics from Python and JavaScript to HTML, SQL, and Linux.
Overclock3D covers technology products, software, computing and internet industry developments.
OverHyped is an NFT marketplace or protocol for buying, selling, minting, or trading digital collectibles.
Overleaf is an online LaTeX editor for scientific and technical writing. It offers a Visual Editor and Code Editor, free templates, and collaboration features. The free plan includes unlimited projects and one collaborator.
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.
The OWASP Cheat Sheet Series is a collection of cheat sheets on specific application security topics, created by application security professionals with expertise in those topics. The site hosts all of the project's cheat sheets and offers downloads of the site and an ATOM feed for updates.
OWASP Top 10 for LLM Applications is a security resource published by the OWASP Gen AI Security Project that outlines the 2025 top 10 risks, vulnerabilities, and corresponding mitigations for developing, deploying, and managing large language model and generative AI applications.
Owncast is a free and open source live video and web chat server that works with existing broadcasting software. Users point their live stream at an Owncast server they control. It includes built-in chat with moderation tools and custom emotes, custom branding and domain options, notifications, and fediverse support. It runs on the user's own server with standard streaming protocols.
OwnTracks is an open-source tool that lets users keep track of their own location, build a private location diary, or share it with family and friends. It uses open protocols for communication. Users install it on a smartphone and can connect it to an existing server or set up their own following a booklet guide.
Oxford English Dictionary helps learn languages with dictionaries, reading tools, lessons, pronunciation, or study resources.
Oxford Online provides educational videos, lessons, tutorials, or self-learning resources.
