ComPDFKit PDF SDK - ComPDFKit SDK is designed for developers to integrate editing PDF content (text & images), creating, editing, annotating, converting, merging, splitting, and redacting PDF files.
Wondershare PDFelement - All-in-one PDF editor
PSPDFKit - PSPDFKit is the best framework for working with PDF files. Our SDK provides first-rate PDF solutions for your application with features like annotating, signing, and form filling. We power successful projects for businesses across the globe.
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.
PDFTron - PDF components and tools.
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.