
BillingEngine
7.4#4 in electronic invoicing softwareFrom €6 a monthFree planWebAPI
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BillingEngine suits freelancers and small businesses that need e-invoicing, quotes, reminders, expense receipts, and accounting exports. Its free plan may suit a one-user operation with low monthly document volumes.
Domibus may suit government entities, private businesses, and software or service providers needing interoperable document and data exchange. It requires teams able to manage a self-hosted deployment and its listed server, database, and Java requirements.