IPL Pathfinder: Net.art
A research guide from the Internet Public Library.
http://www.ipl.org/div/pf/entry/48510

Easylife
Host of various net.art projects, new and old.
http://www.easylife.org/

Experimental Intermedia
Experimental Intermedia has been supporting musicians and artists experimenting with "intermedia" since 1968.
http://www.experimentalintermedia.org/

Ljubljana Digital Media Lab
Open-access media laboratory, an initiative of the Open Society Institute, Slovenia, supporting education and research in many fields related to net.art. Operates a guest program presenting international and local artists.
http://www.ljudmila.org/

Post Media
A Post Media Network represents the physical and virtual structure composed of editorial, curatorial, and artist projects focusing on the different perspectives of new media using electronic and computer based mediums.
http://www.michelethursz.com/

äda 'web
Research and development platform, digital foundry with artists invited to experiment with, and reflect upon, the web as a medium.
http://www.adaweb.com/

Artnetweb
One of the first net.art hosts.
http://www.artnetweb.com/

Asseptic
Network of projects. A foyer leading to art, design, essays and web experiments.
http://www.asseptic.org/

Network Museum and Magazine Project
International version of the Japanese web site for Dia Nippon Publishing, showcasing diverse web works by new media artists, with theory articles.
http://www.dnp.co.jp/museum/nmp/nmp_i/eindex.html

Rhizome ArtBase
Online archive of Internet art projects.
http://rhizome.org/artbase/

Turbulence
Facilitates work exploring characteristics of the Web medium, making use of multimedia and online technologies.
http://www.turbulence.org/