Umuse - The universal inbox for all of your email and chat messages.
Umuse is your universal inbox. It combines all of your email and chat messages into one Facebook-like feed. Optimized for message volume and designed for speed, Umuse integrates with Gmail and Slack to give you one view into your digital conversations at work.
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I've been using this application for a few weeks now and have really enjoyed it. After getting fed up with Windows 10's default email app and it's constant deleting drafts and inability to auto-fill contacts, I went searching for a better desktop client. I found what I was looking for in uMuse.
Pros:Clean, fast, searchable
Cons:No font customization(yet), some clients not available