How can I edit a Presentation in Google Drive? Google Drive shows me presentations, spreadsheets and documents, but I only can edit spreadsheets and documents.

So I'd like to edit the presentation locally, but I can't find a way to download it in the first place.

For edit in a tablet, for example with Polaris Office or other free apps.
I'm not sure if the mobile app offers this feature but at least via the web interface you can export your documents to OpenDocument files which you can edit locally. Afterwards, you can upload the edited version.