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limax is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
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data.london.gov.uk
The London Datastore is a free and open data-sharing portal providing access to data about the capital, with over a thousand datasets for citizens, businesses, researchers and developers. The beta Data for London Library, launched in 2025, offers search across London data sources and links to additional datasets.
macau.uni-kiel.de
Open Access publication service of Kiel University.
github.com
mat2 is an open source metadata removal tool written in Python 3. It supports a wide range of commonly used file formats, and is built as a library that powers an eponymous command line interface and multiple file manager extensions. The project is hosted on GitHub under the jvoisin/mat2 repository.
github.com
meta-tags is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
github.com
money-maker-apps is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
mzcloud.org
mzCloud is a curated mass spectral database of high-resolution tandem mass spectra arranged into spectral trees. It supports spectrum, tree, structure, substructure, m/z, and compound name searches, and is intended to help identify compounds, including those not present in the library. The database includes annotated fragments, molecular formulas, identifiers, and experimental metadata. It is an open consortium effort covering fields such as metabolomics and toxicology.
The National Archive of Marine Seismic Surveys is a USGS data website presenting marine seismic reflection data within the United States. Visitors can click the map to select nearby surveys, mouse over survey names to highlight surveys, filter surveys by keyword and open individual survey pages for data and information.
github.com
navi is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
github.com
next-seo is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
github.com
next-shopify-storefront is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
github.com
NotCurses is a library for building complex text user interfaces and character graphics on modern terminal emulators. It supports vivid colors, multimedia, threads and Unicode, and includes visual features such as images, fonts, video, sprites and transparent regions. It is described as not a source-compatible X/Open Curses implementation nor a replacement for NCURSES.
github.com
NotFair is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
github.com
NuvioTV is the official Nuvio Android TV repository. It describes a free, open-source media app for phone, desktop and TV that turns user-supplied sources into a library with artwork, ratings, subtitles and saved playback position. It is built with Kotlin, Jetpack Compose, TV Material 3 and Media3, and requires Android Studio, a JDK and the Android SDK.
oa.mg
OA.mg is a search engine for academic papers that specialises in open access content. It indexes over 240 million open access research papers, enabling users to search for and access full-text PDFs of papers across research fields, by specific author or publication. The platform also provides a Chrome extension to facilitate paper downloads.
oceanrep.geomar.de
OceanRep is an open access digital collection holding the research output of GEOMAR staff and students, with an additional archive of papers on marine sciences. It includes journal articles, conference papers, book chapters, theses and cruise reports, with fulltext where available. It is managed by the GEOMAR Library, supports OAI 2.0, and offers browsing and simple or advanced search without an account.
github.com
opc-skills is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
explore.openaire.eu
Discover research publications, data and software.
openbenches.org
OpenBenches is a platform that hosts a map of public memorial benches. As of the listed data, it includes 44,306 user-added benches, and allows users to search bench inscriptions, view random bench listings, and add new bench entries to the map.
github.com
openclaw-marketing-skills is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.
opendesk.cc
Opendesk is an online marketplace that hosts independently designed furniture and connects customers to local makers around the world. Customers select designs, request quotes from local makers, choose a maker and receive furniture delivered direct from the maker. The project describes a distributed supply chain built through a global maker network rather than mass manufacturing and worldwide shipping.
github.com
OpenPose is a real-time multi-person keypoint detection library for body, face, hands, and foot estimation. It supports whole-body 2D pose estimation as well as 3D pose reconstruction and estimation, and includes a Unity plugin for related use cases.
opentrials.net
OpenTrials is a collaboration between Open Knowledge International and Dr Ben Goldacre of the University of Oxford DataLab. It aims to locate, match, and share all publicly accessible data and documents on all trials conducted on medicines and other treatments globally. A public beta version is available to explore.
github.com
orbit is an open source tool or library for SEO, metadata, crawling, routing, or website optimization.