Mouser's Process Tamer is Freebie of the Month in Gizmo's Support Alert Newsletter - Issue 144, 12th April, 2007.
You can read Gizmo's glowing review here (roughly between April 15 and May 15):
Note that the above URL is time-sensitive, i.e., it displays the current month's issue. I would recommend subscribing to the Support Alert Newsletter. There's a free version and a paid version.
Gizmo also has very nice things to say about the whole DonationCoder concept: "It's a clever and ethical way to encourage users to recognize the work done by freeware authors and I support it fully. I donated generously and I hope you do too."