bluewallet stands out for mobile onchain bitcoin transactions with a self-hosted full node. it's fully open-source, supports connecting via your own electrs server (built on bitcoin core), and offers watch-only wallets for added security on resource-limited setups.
bluewallet.org
electrum is a solid alternative—lightweight, open-source, and directly configurable to your personal electrum server for full node integration without trusting third parties.
electrum.org
