Phoenix is a mobile Bitcoin wallet using Lightning to send and receive payments. Available on Android and iOS. Phoenixd is just like Phoenix for mobile, except it runs on a server.

btcd is an alternative full node bitcoin implementation written in Go (golang).

Stack Duo is an open source, privacy-friendly Bitcoin and Monero wallet. Available on iOS and Android.

BlueWallet is a Bitcoin and Lightning wallet built with React Native and Electrum. Available on iOS, Android, and macOS.

Bitcoin Keeper is an open source, mobile multisig bitcoin wallet with inheritance features. Available on iOS and Android.

The Lightning Network Daemon (LND) is a complete implementation of a Lightning Network node developed by Lightning Labs.

Labelbase is a label management service for Bitcoin transactions and addresses. It supports BIP-329, a format for unifying label data. The goal of the project is to offer a convenient solution for managing labels associated with Bitcoin transactions and addresses across wallets and other tools.

Bitcoin Knots connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

COLDCARD Mk4 firmware v5.3.2 and Q firmware v1.2.2 have been released. It introduces several new features, along with various enhancements and bug fixes. Notably, the update includes NFC Push Tx, which enables the transmission of signed transactions to the blockchain via NFC and a web service.