SAN FRANCISCO—The company behind Second Life, the community-building online fantasy whose popularity spiked a decade ago, is preparing a third life — this time with a social virtual-reality venture.

Linden Lab announced on Monday that Mac OS X v10.3 “Panther” users can now join the online world of Second Life as beta testers. The company announced plans to produce a Mac version of Second Life ...

A version of this article was published in TIME’s newsletter Into the Metaverse. Subscribe for a weekly guide to the future of the Internet. In 2007, Second Life founder Philip Rosedale made a bold ...