I downloaded Sabre and followed the directions to install it. I activated it then went to the Manage > Sabre page and got a whole bunch of errors (I deleted the beginning of the path):
Warning: include_once((deleted)/blog/PLUGINDIR/sabre/sabre_css.php) [function.include-once]: failed to open stream: No such file or directory in (deleted)/wp-content/plugins/sabre/sabre_misc.php on line 205
Warning: include_once() [function.include]: Failed opening '(deleted)/blog/PLUGINDIR/sabre/sabre_css.php' for inclusion (include_path='.:/usr/local/php5-fcgi/lib/php') in (deleted)/wp-content/plugins/sabre/sabre_misc.php on line 205
Warning: require_once((deleted)/blog/PLUGINDIR/sabre/sabre_admin.php) [function.require-once]: failed to open stream: No such file or directory in (deleted)/wp-content/plugins/sabre/sabre.php on line 36
Fatal error: require_once() [function.require]: Failed opening required (deleted)/blog/PLUGINDIR/sabre/sabre_admin.php' (include_path='.:/usr/local/php5-fcgi/lib/php') in (deleted)/wp-content/plugins/sabre/sabre.php on line 36