Poedit is a free and open-source translation editor that allows users to edit and manage gettext PO files. It's a powerful tool for translators, localization teams, and developers who need to manage translations for their software, websites, or applications. With Poedit, users can edit translations, validate syntax, and compile catalogs.
If you're looking to use Poedit without purchasing a license, you can download it from its official website: https://poedit.net/.
If you are looking for the specific "interesting features" that come with a license key, the Pro version Automatic WordPress Translation