Software for reading writing and updating pdf files
Quite basic but really simple and quick editor for filling in form.
Doesn't interfere with the original PDF graphics which is what you want when filling in forms.
Recipients don’t even need to register – they can e-sign using any device with a browser.
E-Sign will take care of all your signing needs: you can prepare, send and track the status of your packages directly through Soda PDF.
I've tried Okular but the notations are too big to fill out exercises from pdf workbooks. I don't care whether it is open source or I have to pay a reasonable price for it. I found flpsed to be very slow and most importantly not very gracious in handling PDF files.