Best Git-GUI password manager , password storage and helper. No complicated configurations required. No strange foreign binaries required. Portable-way storage.

1. find git-gui--askpass file in your Git installation path (in C:\Git\mingw64\libexec\git-core\ or something with your installation path)
2. overwrite or edit git-gui--askpass
3. Ready to use!

Added block for login insertion as text, directly from code:

if {[string match "{Username *}" $argv]} {
	set answer "edit_to_place_email_here_used_as_login@your_email.ru"
}

Added block for password insertion as text, directly from code:

if {[string match "{Password for *}" $argv]} {
	set answer "edit_to_place_passowrd_here_used_as_password_for_git_repos_server"
}

Modified caption/name of window, to provide user understanding of what is happening:

wm title . "OpenSSH_Edit_to_place_here_profile_name_to_identify_action"