There are 4 repositories under fish-completion topic.
{bash,zsh,fish,powershell,nushell}-completions for 1000+ commands.
Populate rich completions using fish and remove the default bash based completer
Provides shell completion of saml2aws in Fish
Swift tab completion for fish shell.
My linux dotfiles
My attempt at creating bash, zsh and fish completion support for git-flow (AVH Edition)