GNU Taler is a free-software payment system for online payments that work without buyer registration and protect data by default. It is developed within the GNU project and, according to the project website, works with existing currencies rather than creating a new one. Operators run the components themselves: an exchange, a merchant backend, a point-of-sale app and bank integrations. It is designed to let communities run their own payment infrastructure, as an alternative to card networks and wallet checkouts that route payments through a third-party platform.
GNU Taler is maintained by Taler Systems SA, founded in 2016 with its business location in Erpeldange, Luxembourg; the copyright notice also names GNUnet e.V. The project documentation states GPLv3 or later. Because operators run their own installations, payment data sits on infrastructure they control. The project website describes no developer-hosted service for third parties and gives no GDPR commitment from the developer. A European organisation deploying GNU Taler therefore carries hosting and data-protection responsibility itself, and the developer is established in the EU.