The uninstallers would be in the same location at the application, if they've created a folder. Sometimes, the uninstallers are in the original DMG file you used to install an application.
The rule of thumb, usually, is that if you had to go through a formal installation process (apart from my dragging the application icon to the Applications folder), there will be a formal uninstallation process as well.
Otherwise, just use the AppCleaner app I mentioned above, click on the Applications tab, check the ones you want to delete, click Search and then Delete.