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G8 InvoicingInvoiceShelf
Free

Free and open source under the GPL-3.0 licence.

 Free

Free and open source under the AGPL-3.0 licence, with no per-seat fees.

Android Web, Self-hosted
  • Converts quotes and delivery notes into invoices
  • Exports PDF, Factur-X and CII-XML
  • Invoices, estimates, payments and expenses in one place
  • Recurring invoices and a customer portal
  • Small project with a limited user base
  • Android is the only documented platform
  • You maintain the server and backups yourself
  • The 3.x branch is an alpha preview not meant for production data
Downloadable app Self-hosted
Open source Open source
License: GPL-3.0 License: AGPL-3.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.