SmileOnMyMac has released PageSender 4.6 (http://www.smileonmymac.com/PageSender/), an update of its fax software for Mac OS X. The upgrade adds eight fax-via-email services, including Concord Fax and Rogers Business Internet Fax.
PageSender 4.6 also fixes a possible hang when viewing incomplete received faxes, and features other minor fixes and improvements.
PageSender 4.5 costs US$39.95 (though version 4.6 is a free update for registered users of version 4.x. Registered users of previous versions can upgrade for $20. A fully-functioning demo version is available for download.