Several excellent free bookkeeping software options exist for small businesses, with Wave Accounting and Zoho Books often topping the lists. Wave is known for its user-friendly interface and basic accounting features like invoicing and expense tracking, while Zoho Books offers a forever-free plan with essential features for online accounting. Other strong contenders include GnuCash, known for its open-source nature and comprehensive features, and ZipBooks, which excels in invoicing.