Anvil PDF Filling API - The easiest way to programmatically populate any PDF
Drawy - Learn to draw, use camera to score your drawings
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
Iceberger - Draw an iceberg and see how it will float
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Stickman Builder - Free parametric graphic Stickman Builder, creates fascinating stick figures on the fly.