Doodle for Messenger - Doodle Anything and Send it on Facebook Messenger
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.
ScribbleBoard - iOS8 Keyboard for hand drawing your messages
RadaeePDF - RadaeePDF is a library for developers who want to render, manipulate, annotate PDF files on Android, iOS and Windows.
Anvil PDF Filling API - The easiest way to programmatically populate any PDF
Secure PDF Viewer - Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or...