Is Bifrost Wallet open source?

I'm curious to know if the Bifrost Wallet is open source. Open source software typically allows for transparency, community involvement, and improved security through peer review. Can you confirm if the Bifrost Wallet's codebase is publicly accessible and modifiable by developers, or is it proprietary and closed off from external contributions? Understanding the openness of the wallet's source code is crucial for assessing its trustworthiness and security among the cryptocurrency community.