UPDATE: see here.
Updated, small bugfixing and,
Update the DanbooruProviderList.xml as suggested by max and trick.
- moe.imouto.org
- gelbooru.com, different api
- nekobooru.net
- safebooru.org, different api
- hijiribe.donmai.us
- sonohara.donmai.us
- ichijou.org
Please note that gelbooru and safebooru use different api from standard danbooru, and I don’t know if they provide json api (in the documentation only have xml).
Download link here.