Doodle for Messenger - Doodle Anything and Send it on Facebook Messenger
genei.io - AI-generated summaries for any article or research paper.
ScribbleBoard - iOS8 Keyboard for hand drawing your messages
Lumin PDF - Lumin is a fast, easy-to-use, and secure PDF viewer, editor, and sharer that lets you view and fill in PDF forms.
Anvil PDF Filling API - The easiest way to programmatically populate any PDF
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.