Sweden has a long history of anarchist organizing. For an overview, here a few links that will provide a first overview. Although not all of the following groups and organizations are explicitly anarchist, they have all, in one way or another, played an important role in the history of Swedish anarchism:

Anarchopride
anarkisterna.com/anarchopride.

Anarkisterna.com, anarchist info site (Swedish/English)
anarkisterna.com.

Anarkistiska Studier Förlag, publishing the writing series Anarkism (Swedish)
anarkism.nu.

Arbetaren, SAC journal
Wikipedia.

Batkogruppen, publishing Dissident (Swedish/English)
www.batko.se.

Black Ribbon – nominate this year’s anticapitalist militants!
svartabandet.wordpress.com.

Blackwell’s International Encyclopedia of Protest and Revolution entry: Anarchism in Sweden.

Brand – anarchist journal since 1898 (Swedish)
www.anarkistisktidning.org
.
www.tidningenbrand.se.

Motkraft, activist info site (Swedish)
www.motkraft.net.

SAC, Syndicalist Union
www.sac.se.
Wikipedia.

SUF, Syndicalist Youth Federation
www.suf.cc.
Wikipedia.

Yelah, online journal (Swedish)
www.yelah.net.