If you want more extensive accounting features, Zoho Books has a free plan for businesses with under $50K USD in annual revenue. With a stellar (and again, free) bookkeeping and invoicing app, it's also good for freelancers on the go.

Thanks to its its built-in time tracking (which syncs easily with invoices), estimate-to-invoice conversion, and client portal for straightforward collaboration, Zoho Invoice is ideal for freelancers who frequently collaborate with customers.

Expense tracking, receipt scanning, and time tracking.

Estimates (easily convertible to invoices).

Automatic recurring invoicing and customer payment reminders.

Professional, customizable invoices with multi-currency and multi-language support.

While it's not quite as fully featured as Zoho Books, Zoho's accounting-specific product, Zoho Invoice has more than enough features to recommend it-and, obviously, they're entirely free: This software does much more than send invoices (though you shouldn't overlook its stellar invoicing features-Zoho Invoice is actually our top pick for billing and invoicing software).

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