Chatbot Arena.

An AI testing ground that helps users and developers evaluate, improve, and probe the strengths and weaknesses of different AI models. Users input prompts and watch as the models compete, providing answers in real time. After the chatbots have formulated responses, users rank the models in order of usefulness. A range of queries, including creative writing prompts, multi-turn conversations, and coding assignments, make it possible to evaluate models for different purposes.

MusicBrainz.

This vibrant, open-source encyclopedia of music information collects and shares metadata on artists, recordings, labels, instruments, events, and more. All kinds of music are represented, from classic rock to indie rock to video game music. Users can join the MusicBrainz community and contribute information about their favorite artists and recordings. Searches can be conducted through advanced criteria, tag clouds, and CD stubs. An invaluable resource for music-minded patrons.

Nonprofit Explorer.

This offering from ProPublica allows users to research U.S. charities and nonprofit organizations, drawing upon Form 990 data to provide a picture of an organization’s revenue, expenses, assets, and liabilities. Recent updates make it possible to search for organizations that have reported significant theft or have been flagged for serious financial issues, including the failure to follow legal or contract regulations, deficiencies in internal or governance controls, and instances where expenses have outstripped revenue.

OpenAlex.

An invaluable database for researchers and scholars, this comprehensive catalog offers free, transparent access to scholarly articles, datasets, books, dissertations, authors, institutions, and more. The platform allows users to track connections between works, concepts, affiliations, and funders, promoting an inclusive, open atmosphere of sharing and communication. The quality and breadth of the datasets and the speed and intuitive user experiences make this a game-changer for researchers, creators, and students alike.

OpenScholar.

A joint project between Semantic Scholar and the University of Washington, this research-oriented AI tool answers scientific queries by identifying passages sourced from Semantic Scholar’s 45 million open-access papers. Unlike many other AI tools, OpenScholar utilizes an array of advanced retrieval techniques to return verifiable, citation-backed responses; the model is remarkably efficient and accurate, with applicability across a range of scientific disciplines. Every aspect of this model is open-sourced and reproducible.