I use Freeagent here in old Blighty, mostly because the accountant likes it and it does an OK job importing from the bank. Would prefer a lightweight FOSS solution though, neither GNUCash nor h/ledger seem to fit the bill, particularly for auto-generating personal and corporation tax amounts due.

Have considered making a spreadsheet, as amir6 uses in this thread, but it would be missing many features. A collective effort to build out the templates might eventually get there though...