Jotform PDF Editor - Automatically create polished, designed documents
PlutoPDF - A URL to PDF converter wrapped behind a simple API.
PDF Viewer - Read, review, and annotate PDFs with ease
Pdf.to - Convert PDF to Word, Excel, JPG, & from. Also compress PDF
PlatoForms - Convert PDFs to forms and let people fill them easily.
Athena PDF - Elegant, open-source PDF converter.