The best alternatives to Sort Gmail Inbox by cloudHQ are Canary Mail, KanbanMail, and DarwinMail 💌. If these 3 options don't work for you, we've listed a few more alternatives below.
Github Email Hunter helps you find anyone's email address, as long as they have a Github account. It's great for contacting other developers, reaching out for help, or seeing who worked on a repo. You can search emails for an individual user or a repo.