The Delphi Stomp Client project is a complete STOMP client for Delphi 2010 (should works also in Delphi 2007 and 2009) and FreePascal 2.4.x.
Can be used with the built-in INDY library or with Synapse in Delphi (there is a compiler directive) and only with Synapse in FreePascal.
The Delphi version is mantained by Daniele Teti (project owner).
The FreePascal version is mantained by Daniel Gaspary.
Major info can be found here:
Delphi Stomp Client Home Page (Daniele Teti web site)