https://cryptoterminal.eu/

CryptoTerminal is an open-source terminal application with which merchants can accept in-person cryptocurrency payments. The goal of the project is to be an on-ramp for non-technical business owners (and their customers) to learn about and use cryptocurrencies in their everyday lives. The project currently supports Bitcoin (+ Lightning Network), Litecoin, and Monero.

The application source code and issue tracker can be found on GitHub here:
https://github.com/samotari/crypto-terminal

The PlayStore listing (currently a Beta release):
https://play.google.com/store/apps/details?id=com.github.samotari.cryptoterminal

We have plans to release it for iOS in the not-so-distant future as well.

We are reaching out because we are looking to spread the word about the app, to gather feedback, and to invite any interested programmers and designers to join us on the project.

Thank you for your time and have a great day!