A Simple List of Nostr Signers

Extentions:

https://chromewebstore.google.com/detail/flamingo-%E2%80%93-nostr-extensio/alkiaengfedemppafkallgifcmkldohe

https://chromewebstore.google.com/detail/nos2x/kpgefcfmnafjgpblomihpgmejjdanjjp

https://chromewebstore.google.com/detail/aka-profiles/ncmflpbbagcnakkolfpcpogheckolnad

https://keys.band/

https://github.com/haorendashu/nowser

The Remote Signer:

https://nsec.app/

https://github.com/kind-0/nsecbunkerd

Native Android Signer:

https://github.com/greenart7c3/amber

iOS

https://testflight.apple.com/join/8TFMZbMs

https://testflight.apple.com/join/DUzVMDMK

Higher Security Options:
To start using Nostr with a secure, recoverable keypair:
https://nstart.me/en

For Existing Keys:
https://www.frostr.org/

Thank you to https://nostr.net/ for keeping a thorough list of Nostr apps, clients, and tools!