For simple translations that do not involve any customization, you can get quick results by using the FME Quick Translator.
Advanced FME users can also execute custom mapping files through this interface.
If you want to add customizations or detailed transformations, including those that require multiple input and output formats, FME Workbench is the best tool. FME Workbench is also the easiest way to apply the processing facilities of FME to your data as it is translated.