I've run and invested in businesses in multiple countries (Spain, Germany, US, UAE, Sri Lanka). One of them (Mobile Jazz - a fully remote company) we've moved to Estonia in 2016. One of the best business decisions we've made admin-wise. While there are for sure better alternatives when it comes to "saving on taxes" (I'd say Estonia is in the European average with 20% corporate tax and an interesting taxation model on…
Would you recommend Estonia for setting up a freelancing business -- as in establishing a legal entity for self-employment?
The taxation system itself is very simple, if VAT isn't involved. You can just enter your annual income and the calculator will tell you all of the numbers. Just make sure you use the "salary/wage fund" as the income field for a freelancer.
One thing to keep in mind though is that countries where you actually perform the work usually want a piece of the pie. That can complicate things significantly.