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Rechnungs-AssistentG8 Invoicing
Free

Free and open source under the GPL-3.0-or-later license.

 Free

Free and open source under the GPL-3.0 licence.

Linux Android
  • Stores customer and item details for reuse
  • Imports and exports data as CSV
  • Converts quotes and delivery notes into invoices
  • Exports PDF, Factur-X and CII-XML
  • Designed for German invoicing
  • Available for Linux
  • Small project with a limited user base
  • Android is the only documented platform
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0-or-later License: GPL-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 8, 2026

Checked October 2, 2026

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