Google Inc. has acquired a California startup that develops online collaboration tools known as wikis.

The announcement came Tuesday through separate Web log postings by Google and JotSpot Inc. Terms were not immediately disclosed.

Wiki tools, popularized by the online encyclopedia Wikipedia, let users to create, modify and even delete information on what others in a group have worked.

As JotSpot makes the transition to Google's systems, new registrations have been suspended.

JotSpot has both free and paid versions. The free, JotSpot-hosted service restricts the number of pages and the size of the collaborating group.

Shares of Google rose $2.32 to $478.89 in early trading on the Nasdaq Stock Market.