UI Garage - Specific mobile and web design patterns for your inspiration

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.

Muzli - UI/UX and Design Inspiration Chrome Extension

Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.

Design Hunt - Curated design inspiration for everyone

Wondershare PDFelement - All-in-one PDF editor