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Notes/List of APIs

This is a collection of free and (in my opinion) useful APIs or sites that publish their data as a free download. Please note, that free only means free avaiability, not free license. Please refer to the respective websites of the APIs for license information.

List of APIs

General/Unclassified

Tinydb.org is a small Web 2.0 database similar to tinyurl where you can store random data, The API is accessible via HTTP in JSON and XML format.
The Wikimedia Foundation provides both database dumps and a feature-rich, multi-format API.

Books/Movies/Books

MusicBrainz provides both database dumps and a REST API.
isbndb.com provides a simple XML API.

Events

JamBase has a big live music event database which can be queried using a XML API~ (non-commercial only).

Internet

Akismet.com provides a simple HTTP API to check comments to your blog/newssite/etc. for spam.
Browsershots offers a XML-RPC API to make screenshots of a website with different browsers. Click here to see an example python client.
Gumby provides a simple IP2location API in XML, JSON and PHP serialized format. Don't really know though, if using an API is better than using your own geolocation database.
serversniff.net calls itself the "Swiss Army Knife" for administrators and webmasters. They provide a broad API (with a mix of plain-text and XML) to tools like HostOnIP or Subdomains (displays all DNS records pointing to an IP or a list of subdomains of a domain respectively).