Solid Productivity Tool

Very intuitive and clean UI. Good number of export options (although no Dropbox). Works well.

Heads Up: If you are using iCloud Photos, this app, and others like it, will only recognize photos from your photo library that have been downloaded from iCloud. Most of your photos are probably on your iDevice as thumbnails. If you want to use a photo from your library with this app, tap on the thumbnail in Photos. This will open the thumbnail in full screen mode and initiate the download from iCloud. It will then be available in this app.

Mr. Luigi about PDF Photos