I do not get over my astonishment, and that is that WordPress is becoming a MegaSuite, mainly thanks to the plugins. And now you can even bill your customers without leaving WordPress. Forget about Word or Excel to make the invoices, you can do everything without leaving your blog.
I love the idea, especially because although there are many applications free billing there are few that, being free, work as well asand above without leaving the administration panel of your blog.
Of course, there are things to improve or add but as a solution of web invoicing to customers is great, generates a record of invoices, has a search engine, you can mark them as paid, and everything online, without installing anything.
Did you imagine that there was something like that ?, it's more, do you know of any more WordPress virguería of this style?