Caravan is a stateless and flexible multisig coordinator that integrates with your hardware or software keys and your bitcoin node or a block explorer. Caravan makes it easy to build and spend from multisig addresses right in your web browser.
Hermit is a command-line, sharded, air-gapped wallet designed to help groups of people safely manage and use bitcoin private keys through leveraging the emerging SLIP-0039 standard. Hermit communicates entirely through QR codes, using a camera and screen. It is designed to run in a stripped-down Linux environment on custom hardware with WiFi, Bluetooth, USB, and all other forms of wired & wireless communication removed.
Unchained Capital contributed the C-Library for the SLIP-0039 Shamir sharing protocol. SLIP-0039 allows for hierarchical shards of private keys, which gives individuals and groups more flexibility in how they store and interact with private keys.