[skrowl]

A shared workspace for secrets as long as none of your friends using Windows, Android or iOS have secrete to share, apparently.

[yellowapple]

There's a Windows version on their download page: https://get.torus.sh/

Doesn't solve the lack of mobile support, but hopefully the fact that the client-side code is already free software (and under a liberal license, to boot) means that the community can fix that problem if all else fails.