QuickBooks Online Accountant might be a bit more popular than Karbon. We know about 1 link to it since March 2021 and only 1 link to Karbon. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Similarly, Karbon (part of the Calligra suite) absorbed the suite's dedicated flowchart tool, and is pretty functional for this purpose, but it's primarily developed for Linux. While they have Windows installers, they're not the easiest to find and aren't directly supported. Source: about 2 years ago
For quickbooks specifically you can get a free license to Quickbooks Online Accountant which is near full version of the online software: https://quickbooks.intuit.com/accountants/. Source: about 1 year ago
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