With around 300 entries covering both artists and art movements there’s a lot of good information there too, although again, the site and graphics are pretty old.
The Artchive takes a slightly different route than the webmuseum, however. If you click on any artist’s name you’ll probably find one or two excerpts from a book about the artist, or an essay by an art historian. There are also plenty of pictures.
Be prepared for a lot of advertisements (including pop-ups). The ads are annoying, but they do keep the artchive up and running so I guess it’s worth it.
I just found the-artists.org a few weeks ago, so I haven’t used it as much as the previous two but I’m sure I will. It has a big selection of modern art information, starting in the mid-1800s with Impressionism and going all the way to present day.
You can search by art movement or artist, read recent art news (basically press releases) and find reviews of art books as well.
The-artists.org also allows artists to publish their own press releases on the site, and basically self-promote their own artwork for free, within some limitations.