GnuCash is free accounting software for personal and small business use.
I'm a bookkeeper by training who got into computers early in my career. I was already handling financial books in my on-the-job course in college. Back when I'm still using pen and paper, the calculator is still on my desktop ( a real Casio calculator and a real desk). That summer job environment has gone the way of the dinosaur and the next year I was employed by a company with IBM machines and my journey in the world of computerized accounting started. Twenty-seven years on, my personal finances are in the hands of more powerful computers and certainly more ubiquitous applications.
I have been using GnuCash for two years to handle my small apartment rental business and my bank account. In addition to a desktop computer, I have an 8-inch tablet and my android smartphone. GnuCash can run on all these devices in varying form and features. I employ a cloud service to sync the data file on all devices. So I can pretty much check and analyze financial data, run graphs anywhere I happen to need it. I can create statements and graphs from updated database as soon as I enter the current data in a few clicks. GnuCash runs on Windows 10, Mac OS and Linux. They also have an app in Google Play.
I need GnuCash to have ready business forms like receipts, payment orders and automatic receivables summary. An easy printing feature to help users make hardcopy. Perhaps a notification system isn't a bad idea too.