I've been learning about Solana (SOL) and during this process, I've built a service called 4lamports. It's a simple tool that helps you find hidden SOL in your own wallet (Solflare, Phantom) by reclaiming the rental fee charged by Solana for 0 balance token accounts and transferred NFTs. The code is open-sourced and you can check it to ensure there is no malicious line before trying it. I hope you find it useful and I'm very open to new ideas and feedback.