Not included in your list but fairly obvious: some sort of automated billing/invoice system that feeds into a bookkeeping system which I suppose eventually feed

Not included in your list but fairly obvious: some sort of automated billing/invoice system that feeds into a bookkeeping system which I suppose eventually feeds into an accounting + tax system. I like doing my own work but I loathe the tedium of owning my own business. Make that as painless as possible (of course with specific regard for freelancers otherwise we’re kind just talking about Atlas.)