not for printing invoices , I do use google docs for many things.

also Microsoft word now has a web option so you may not want to rule that out

they call the new cloud office product , Office 365 basically you can log in from where ever you are and do the same functions then print locally or save to the included web storage.

I use Skynova

Might look at quickbooks.

I have used "Invoice.app." for over a year now and like it a lot. It automatically syncs invoices across all my devices including customer base etc. I can write invoices on my Laptop, iPad and phone I can install shortcuts for tings that keep coming up the same like hourly rate and different tax rates etc. Simple and quick.

Adobe Acrobat

I figured some of your little people took care of all that for ya.

I use Jobber. It really helps keep everything straight, you can save the client, send estimates or correspondence by emails or text and invoices. I feel like I made 40,000 more this year just because it kept me organized