There's another signer in development now by nostr:nprofile1qqszjvsfwh0c2hlrffa5ttdzgg0zcaquxlqpx6gplerhzvafr6cckpcpp4mhxue69uhkummn9ekx7mqpzpmhxue69uhkummnw3ezuamfdejsz9rhwden5te0wfjkccte9ejxzmt4wvhxjmcp2f564