Display external RSS feed on pages

You could use a wrapper for fetch_feed() as a simple shortcode.

Very basic example; see the RSS widget code for more options.

<?php # -*- coding: utf-8 -*-
/**
 * Plugin Name: T5 Feed Shortcode
 * Description: Use <code>[feed url="http://wordpress.stackexchange.com/feeds"]</code> to display a list of feed items.
 */

add_shortcode( 'feed', 't5_feed_shortcode' );

function t5_feed_shortcode( $attrs )
{
    $args = shortcode_atts(
        array (
            'url' => 'http://wordpress.stackexchange.com/feeds'
        ),
        $attrs
    );

    // a SimplePie instance
    $feed = fetch_feed( $args[ 'url' ] );

    if ( is_wp_error( $feed ) )
        return 'There was an error';

    if ( ! $feed->get_item_quantity() )
        return 'Feed is down.';

    $lis = array();

    foreach ( $feed->get_items(0, 20) as $item )
    {
        if ( '' === $title = esc_attr( strip_tags( $item->get_title() ) ) )
            $title = __( 'Untitled' );

        $lis[] = sprintf(
            '<a href="https://wordpress.stackexchange.com/questions/99584/%1$s">%2$s</a>',
            esc_url( strip_tags( $item->get_link() ) ),
            $title
        );
    }

    return '<ul class="feed-list"><li>' . join( '</li><li>', $lis ) . '</ul>';
}