Things like appdelete may have a use for applications with an installer (ie Adobe apps), but as psychofreak said, if the apps you downloaded to try had "drag and drop" installs (that is, dragging the application from the install disk image to the Applications folder), then just dragging from the Applications folder to the trash is sufficient to completely remove them--nothing more necessary.
Technically, they have probably left a pref file or two in your Preferences folder, but that's maybe a few K max, so can safely be ignored.
And actually, if you're testing and you just open the program directly off of its install disk image, you don't need to do ANYTHING--toss the DMG and it's gone. Try before you install, so to speak.