MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out http://127.0.0.
CARE monitors the execution of the specified command to create an archive that contains all the material required to re-execute it in the same context
Developer tools from Opera, now open source