Currated collaborative list of open (freely available without registration) RESTful API web services. We list each service with a short description, followed by a link demonstrating a representative example of its use. You can use the link on your web browser, through the Unix command line with the curl utility, or with any modern programming language, for example with Python's Requests.

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• Bioinformatics
• Computer networking
• Computer software
• Entertainment
• General
• Medicine
• Transport

• Ensembl - Access genomic data for Homo Sapiens and other organisms. Mutations, DNA sequences, Transcripts and Proteins. Useful also to locate known genotype-phenotype associations; example
• MyVariant.info - Access genetic variation information for approximately 1 billion DNA loci. Read more here; example

• BGP queries - The internet viewed from the Border Gateway Protocol lens; example.

• GitHub - Metadata on public repositories hosted on GitHub; example.
• Docker Hub - Metadata on public container image registries hosted on Docker Hub; example.

• MusicBrainz - Recorded music database; example

• DOI metadata - Search and obtain metadata associated with Digital Object Identifiers; example.
• DOI resolution - Resolve Digital Object Identifiers to their target URL; example.
• Public APIs - List of public APIs; many require registration.
• Wikidata - Collaboratively edited knowledge base hosted by the Wikimedia Foundation; example.

• Europe PMC - Access to over 33 million publications from various sources, including PubMed, Agricola, the European Patents Office (EPO) and the National Institute for Clinical Excellence (NICE); example

• OpenMobilityData - List of General Transit Feed Specification (GTFS) providers.

To the extent possible under law, Diomidis Spinellis has waived all copyright and related or neighboring rights to this work.