Short answer
Moneybird is the most popular Dutch accounting package for freelancers, with an interface in Dutch, English and German and a price that rises with your volume: from €3 a month (Compact, 5 transactions) to €41 a month (Compleet, unlimited), with a 60-day free trial. Booxx costs €19 a month with no transaction cap and works in five languages — Dutch, English, Polish, Hungarian and Romanian — with the ledger accounts, the outgoing emails and the explanations of the VAT boxes translated as well. If you read Dutch easily and want lots of integrations, Moneybird is the safer choice; if you don't read Dutch, you can't run the core of your bookkeeping there yourself.