Adapt is a B2B contact and company database provider across multiple industries. Adapt has 100 million business contacts, including industry-specific company database and contact information such as job title, direct dial, and email addresses.
It's affordable and they seem to be able to find a wide range of contact details. They have a nice Chrome extension which works well.
LeadGibbon allows you to discover new leads based on title, location, industry, and other firmographic data. You can export yout lists easily, or save them and share with your team. LeadGibbon is a great way to find decision-makers with purchasing power.
It's a no-frills tool, but we've heard it works very well! Use their extension to grab emails directly from Sales Navigator, and they will be deposited in a Google Sheet for you.