What was the name of the first web browser, created by Tim Berners-Lee?

The first web browser created by Tim Berners-Lee was called WorldWideWeb.

Berners-Lee wrote WorldWideWeb at CERN during the second half of 1990 on a NeXT computer. It was more than a browser: it was also a web-page editor, allowing users to view documents and create links between them. The first version was completed before 25 December 1990, after roughly two months of development, and the software became available to the wider public in August 1991.

WorldWideWeb supported early web technologies and could work with protocols including HTTP, FTP, and NNTP. Because it was built for NeXTSTEP, some of its editing and display features were closely tied to that operating system. It was also the first WYSIWYG HTML editor, meaning users could see a formatted page while editing it.

The name is easy to confuse with the World Wide Web itself. To reduce that confusion, the application was renamed Nexus in 1994. CERN released its source code into the public domain on 30 April 1993, helping remove licensing barriers as the Web spread. Explorer, Netscape, and Mosaic were later browsers, not Berners-Lee’s original browser.