Guarda (Twitter, Reddit) is a multi-currency wallet that supports Monero. It's available for iOS, for Android, and as a web wallet.

Guarda publishes some of their works as open source on GitHub, but the wallets themselves are closed source.

A fork of mymonero-core-js with 7 own commits and a fork of openmonero with 6 own commits on their GitHub suggest that they use MyMonero technology to support Monero.