Opera Neon is a new concept browser: "a vision of what browsers could become". It was first released in January 2017 and is available for Mac and Windows. The browser is Chromium based but with some additional unique features.
Opera Neon gives the user new ways to interact with web content, including the ability to drag, push and pop the tab icons. There is a vertical visual tab bar on the right side of the browser. Larger bubble tabs in the centre of the browser allow the user to save their favourite web sites. The browser automatically manages these tab icons to ensure that frequently used tabs float to the top. There is a built in snap-to-gallery tool where the user can snapshot and crop part of a web page and save it to the gallery.
When it was released, the Opera Desktop Team wrote a blog post Say hello to Opera Neon, our new concept browser outlining their vision for the future of desktop web browsers.