Feedsnap is a very simple plugin that will render an RSS feed to your post.
<h3>Useage</h3>
Enter the following in your post [feedsnap]feedurl[/feedsnap] where feedurl is the url of the feed you wish displayed.
Example: 
[feedsnap]http://forums.digitalpoint.com/external.php?type=RSS2[/feedsnap]

FeedSnap

Feedsnap is a very simple plugin that will render an RSS feed to your post.

marapper

Automatically copies all posts to a LiveJournal or other LiveJournal-based blog (exclude text in shortcode [nocrosspost]smth[/nocrosspost] – buttons for it added in visual&html editors). Editing or deleting a post will be replicated as well.
Original plugin by Arseniy Ivanov, Evan Broder.

Livejournal Crossposter Remix

Automatically copies all posts to a LiveJournal or other LiveJournal-based blog (exclude text in shortcode [nocrosspost]smth[/nocrosspost] - buttons f …

FeedSnap vs Livejournal Crossposter Remix