There are multiple third-party frontends that leverage the Safe contracts and/or infrastructure. Some of them are listed below.
Coinshift - Smart Treasury Management for crypto organisations
SmartDeFi: Robinhood for Crypto -- Click to Join the Waitlist!
SmartDeFi is an easy to use, non-custodial investment app which fulfills the needs of traditional investors who want to make their first DeFi investments, but don't understand the risks involved or how to take the first steps.