Castor EDC - Castor offers you a user-friendly and fully featured application for electronic data collection.
Wondershare PDFelement - All-in-one PDF editor
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
OpenClinica - OpenClinica is an open source clinical trials software.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.