Which browser suite succeeded the Mozilla Application Suite?

The browser suite that succeeded the Mozilla Application Suite is SeaMonkey.

Mozilla announced in March 2005 that it would stop producing official Mozilla Application Suite releases beyond the 1.7.x line, choosing instead to concentrate on standalone Firefox and Thunderbird. Community members continued the integrated-suite project, and the new project officially adopted the name SeaMonkey in July 2005.

SeaMonkey retained the Mozilla suite's all-in-one approach rather than splitting every function into separate applications. Its components included a web browser, SeaMonkey Mail & Newsgroups, the Composer HTML editor, the ChatZilla IRC client, and an RSS reader. The suite was built from the same broad Mozilla code heritage that also descended from Netscape Communicator.

The name is not a reference to a new browser engine: SeaMonkey used Mozilla's Gecko and SpiderMonkey technologies. It is also spelled with a capital M as the product name, while “seamonkey” historically referred to brine shrimp and served as an earlier Netscape/Mozilla codename. SeaMonkey's first release came in 2005, followed by SeaMonkey 1.0 in January 2006.