The following was sent to me by Greg Spencer. I’ve yet to try FusionReactor myself, but the information and screenshots seem very compelling:
FusionReactor is a really powerful add-on for monitoring, debugging and performance tuning your ColdFusion applications and servers throughout the development, testing and production cycle. It lets you look inside ColdFusion and take action when there are problems. Key features include: see running requests, stack trace and kill requests, system metrics and memory graphs, on the fly search and replace content fixing, page compression and the ability to capture requests/responses in XML! It even has an automatic Crash Protection feature that will notify you when something is wrong and act on it if you want. You can check it out under http://www.fusion-reactor.com/.