Hesperides

Hesperides is an adaptation of Didier Willis' Dragon Flame to Mac OS X. This program offers a "Transcribe to Tengwar" service.

However, to make it work, you have to install the Tengwar fonts system-wide. If you want to add other modes to the app, or other fonts (as long as they are TrueType), you must put any fonts or modes you want in your Library/Application Support/Hesperides folder.