Notability a very powerful, yet wonderfully simple note-taking and PDF annotation app. Very good for organising your notes and backing up to your google drive so nothing goes missing and is easily shared.
PDF Expert 6 is an great app for anyone who reads, annotates or edits PDFs on their iPad or iPhone. This is the only app that allows you to edit PDF text, replace images and hide sensitive data...
iAnnotate is a great way to read, annotate, and share PDFs, Microsoft Office files, images and web pages. You could use it to take notes, sign agreements, highlight documents, insert stamps and much more...
Kami is an application that provides educators and students tools to view and edit documents and PDF files.
Kami also enables users to edit and collaborate on worksheets and interact with PDF files on their Chromebooks.
Kami is also available in the Chrome Web Store and Google Apps Marketplace.
PDF online Reader
Very easy online tool that enables you to upload, edit and then download your Pdf. You can annotate, highlight and add hyperlinks.
pdf 2 go
Upload and edit your document online. This webpage allows you to convert, compress, resize, edit, sort and delete, split or merge your pdf, or even rotate it or password protect it.