PBworks (formerly PBwiki) is a commercial real-time collaborative editing (RTCE) system created by David Weekly, with Ramit Sethi and Nathan Schmidt, who joined shortly thereafter as co-founders. Based in San Mateo, California, United States, the company operates on a freemium basis, offering basic features free of charge and more advanced features for a fee. PBworks' investors include Mohr Davidow Ventures and the Seraph Group, as well as angel investors Ron Conway and Chris Yeh. In 2005, David Weekly began developing software to build privately hosted wikis through a website, which he named "PeanutButterWiki" The companys original name stems from the concept that "making a wiki is as easy as making a peanut butter sandwich". The original beta test of PBworks was released for public comment on 31 May 2005.