- Fabio's Nudibranch Gallery
 - Underwater photographs from the Southern California coast and the Caribbean. - Gordon Smith's Nudibranchs
- Featuring colourful Chromodoridae, Phylidiidae, Polyceridae, and Halgerdidae nudibranchs.
- Guide to Singapore Nudibranchs, A
- Species list, accompanied by photographs of the colourful sea slugs. By Uma Sachidhanandam.
- Jeff's Nudibranch Site and Coral Reef Gallery
- Collection of original underwater photos from his travels in the Philippine Islands.
- Little Animals: Big Bag of Tricks
- Looks at how nudibranchs use colours to ward of predators and to hide.
- Mediterranean Slug Site
- Featuring information and images of Opisthobranchs from the Mediterranean Sea and elsewhere.
- Nembro
- Offers photographs of, and geographic distribution information for, the colourful Nudibranchs, sea slugs, and flatworms. Also in French.
- Nudibranch Page, The
- Profiles these colourful and diverse creatures, commonly referred to as sea slugs, that can be found throughout the world's reefs.
- Nudibranchia on the Coast of Central Norway
- Recording the diversity of nudibranchs on the coast of Møre, Romsdal, Sør-Trøndelag, and Nord-Trøndelag counties.
- Nudibranchs
- Gallery of nudibranchs found in the South Pacific by Steve Norvich.
 Nudibranchs of the British Isles
- Identification guide to the nudibranch sea slugs of Great Britain and Ireland.- Nudibranchs of the Sunshine Coast Australia
- Examines the Indo-Pacific region nudibranchs, flatworms, and opisthobranchs.
- Scottish Nudibranchs
- Photographs of nudibranchs and other sea slugs taken while scuba diving around Scotland.
- Sea Slug Forum
- Ask questions and find out more about nudibranchs, bubble-shells, sea hares, and other sea slugs.
- Sea Slug Page
- Gallery of Opisthobranchia from around Hachijo Island.
- Sea Slugs Madness
- Photoblog of all things sea slug with photos and information on various sea slugs from around the world.
- Seaslug.com
- Provides bibliographic resources for scientific and medical research relating to seaslugs and their allies.
- Sharif's Malaysian Slug Site
- Assists in establishing the ranges of various nudibranchs and other gastropods by illustrating species found in Malaysian waters.
- Skip's Underwater Image Gallery: New Zealand Nudibranchs
- Offer photos and brief description of New Zealand nudibranchs.
- Slug Site, The
- Devoted to study of Opisthobranch Molluscs (nudibranchs), more commonly referred to as sea slugs. Promotes the sharing of sea slug photos to facilitate identification of species and desemination of new range, distribution, and ecological information on species around the world.
- Vibrant Sea: Nudibranchs
- Images of sea slugs from the Channel Islands, the Pacific Northwest, Indonesia, Philippines, and Solomon Islands.
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