Jade DIY is Blockstream's open-source firmware for the Blockstream Jade hardware wallet, made available for installation on compatible off-the-shelf hardware. The project lets users build and verify their own Jade-compatible signing device from generic components.
Krux is open-source firmware that enables anyone to build a Bitcoin signing device from off-the-shelf parts. It runs on cheap, general-purpose microcontrollers (e.g. M5StickV, Maix Amigo, Maix Dock) and turns them into air-gapped signing devices.
RaspiBlitz is a DIY Bitcoin Lightning node project built for education. Unlike commercial plug-and-play nodes, it emphasizes learning the underlying tools.
Open-source, DIY Bitcoin signing device built from commodity hardware. Designed for air-gapped seed generation, transaction signing, and multisig coordination without trusting proprietary hardware.
Specter DIY is an open-source, do-it-yourself hardware wallet project from the Specter suite. It turns commodity hardware into an air-gapped signing device that pairs with Specter Desktop for multisig and single-sig custody.