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Open source travel guide featuring up-to-date information on attractions, hotels, restaurants, travel tips and more. Free and reliable advice written by Wikitravellers from around the globe.

FANDOM is a community-based service that allows anyone to create a wiki on virtually any subject. Discover, share and add your knowledge! Wikia is financed by advertisment!

TV Tropes is a wiki that collects and expands descriptions and examples on various conventions and devices (tropes) found within creative works.

identi.ca is a free personal web server that implements a distributed social networking service. It is based on pump.io, a free software which make up the distributed social network.

free developer encyclopedia.

Collaborative street-level imagery platform using computer vision and machine learning for mapping, urban planning, transport, and geospatial dataset enhancement.

Over 1.6 million royalty free stock photos and videos shared by our generous community.

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

DeviantArt was created to entertain, inspire, and empower the artist in all of us. Founded in August 2000, deviantART is the largest online social network for artists and art enthusiasts with over 13 million registered members, attracting 35 million unique visitors per month.

Citizendium, powered by MediaWiki, is "an open wiki project dedicated to creating a free, comprehensive, and reliable repository of structured knowledge". Unlike with Wikipedia, a contributor must register using their real name and verify their identity.

OpenGameArt.Org is an online asset repository of freely licensed graphics, models, sounds, & music for use in free & commercial games & other media.

The Freesound Project is a collaborative database of Creative Commons licensed sounds. Freesound focusses only on sound, not songs.

MDN Web Docs is an evolving learning platform for Web technologies and the software that powers the Web, including:

• Web standards such as CSS, HTML, and JavaScript
• Open Web app development
• Firefox add-on development

Creative Commons music archive. The Free Music Archive is an interactive library of high-quality, legal audio downloads directed by WFMU, the most renowned freeform radio station in America. Radio has always offered the public free access to new music.

Unlimited access to ebooks, audiobooks, magazines, and documents with offline use, community reviews, multiple languages, and unique uploading options.

ccMixter is a community music site featuring remixes licensed under Creative Commons where you can listen to, sample, mash-up, or interact with music in whatever way you want.

MusicBrainz is a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program — for example, a CD player program can use...

Khan Academy is not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.

Long running independent news outlet that operates entirely on donations, rather than commercials. Democracy Now! is a national, daily, independent, award-winning news program.

In 2006 Al Jazeera Satellite Network was changed to a public utility, private corporation by a public memorandum and articles of association in accordance with the provisions of (Qatar) Law No. 21 of 2006, and was re-named “Al Jazeera Media Network”.

Trust Café (formerly WT Social / WikiTribune) is a privacy-focused and ad-free social network that places a special emphasis on evidence-based journalism. The platform survives on the generosity of individual donors to ensure privacy is protected and social space is ad-free.

OpenSeaMap's goal is to add nautical and tourism information a sailor could be interested in to OSM (OpenStreetMap) and to present it in a pleasing way.

Browse subject categories to explore new topics or look for reference material for a course you are already studying.

KartaView is a free and open platform for street level imagery. Anyone can contribute images with a smartphone and the open source apps.

Free high-resolution photos for any use. Access millions of curated images without a subscription or licensing restrictions. Explore and contribute.

OpenStreetMap is a project aimed squarely at creating and providing free geographic data such as street maps to anyone who wants them. It is a free editable map of the whole world. It is made by people like you.

Stack Overflow, part of Stack Exchange, is a free, community-driven, reputation-based Q & A site for computer programmers. No membership is required to ask questions or provide answers to questions by others.

Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum...

Public library of Science.

Jamendo is a community of free, legal and unlimited music published under Creative Commons licenses. Share your music, download your favorite artists!.

Wikimedia Commons is a media file repository making available public domain and freely-licensed educational media content (images, sound and video clips) to everyone, in their own language.

Vimeo is the best way to get your videos online in the highest quality with great tools to share publicly or privately.

The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, it provides free access to researchers, historians, scholars, the print disabled, and the general public.

Sketchfab is the first web service to publish interactive 3D content online in real-time without plugins.

A video-sharing platform allowing users to upload, view, and share videos, including clips, music videos, and educational content.

Free content, multilingual online encyclopedia written and maintained by a community of volunteers through a model of open collaboration, using a wiki-based editing system.

Platform for exploring a vast global music catalog, with direct artist support, instant streaming and download of DRM-free purchases, and physical merchandise.

Online social photo and short video sharing community. Flickr helps you organize that huge mass of photos you have and offers a way for you, your friends and family to tell stories about them.

Over 2 Million curated icons, created by a global community.

Created as a way to effectively illustrate sometimes complex actions, to[icon] provides high quality icon collections spanning series like "Hatches", "Flat Shadows", "Isometric" and "Blueprint".