Xyndy

Syndy supports links to OPML files outside: represented by the value link of the type attribute.

This may bring distributed OPML directories. I'll write about this later.

OPML type node has an icon from "OPML Icon Project" and is a link to the refered OPML document. Selecting OPML node in the left-top pane, you can choose whether to load the OPML document in the displayed window or to load it into a new window.