https://getumbrel.com/ – Run your own full bitcoin and lightning node. Very simple, very open, very free.
https://lnmarkets.com/ – Trade sats on lnmarkets with up to 50x max leverage (1Mil Sats Max Deposit).
https://boltz.exchange/ – Instant private exchange to trade between native bitcoin and other chains.
https://simpleswap.io/ – Instant private exchange to trade between native bitcoin and other chains.
https://stealthex.io/?to=stx – Instant private exchange to trade between native bitcoin and other chains (STX included).
https://www.hiro.so/ – Enables apps, smart contracts, and digital assets for Bitcoin (wallet to hold stacks (STX))
https://app.arkadiko.finance/ – A decentralized, non-custodial liquidity protocol where users can collateralize their assets (STX) and mint a stablecoin called USDA.
https://electrum.org/#home – Bitcoin wallet. Create a hot wallet, cold wallet, or multisig wallet. Fully open source.
https://muun.com/ – Bitcoin and lightning wallet. Munn is a self-custodial wallet for bitcoin and lightning.