GnuCash is described as 'Flexible accounting software for personal and small business use, GnuCash is freely available under the GNU GPL, supporting multiple OS and financial tasks' and is a very popular Budget Manager in the business & commerce category. There are more than 100 alternatives to GnuCash for a variety of platforms, including Windows, Web-based, Android, iPhone and Mac apps. The best GnuCash alternative is MoneyManager Ex, which is both free and Open Source. Other great apps like GnuCash are HomeBank, Firefly III, Actual Budget and KMyMoney.