I have one, but you won't like it: mac keychain, I was able to make it work with my client so far.
On windows machines browsers like Chrome use secure storage for passwords as long, as you have master password on your machine, but it just means password-password system which is kinda dumb for most people since they use admin12345678 or something similar.
But that also means booting an entire ducking browser just to keep that password slotted in.
At least, that's what I came up with.
