Moneybird is a great accounting tool. Originally started as a simple invoice sending tool, it has now turned itself into a pretty allround accounting tool. And I think it’s pretty affordable for small businesses (10 – 25 euro / month, depending on your package).
For the licensing of of Really Simple SSL premium plugins I have used Easy Digital Downloads since the beginning, and it has made it possible for me to focus entirely on the functionality..
Because these tools both are really making my life easier, we developed an integration of Moneybird and Easy Digital Downloads which synchronizes all purchases in Easy Digital Downloads to Moneybird. You can let Moneybird handle the sending of invoices you want, but you can also let EDD Moneybird map the tax rates you use in Easy Digital Downloads to Moneybird. This will be useful when you’re selling to  European countries, and maybe in other situations as well.
As we have stopped developing this product, if you’re interested in getting a plugin to handle this for your website as well, we recommend taking a look at the solution from the developer of CAOS and OMGF, Daan van den Bergh.
