Making up KDE's Calligra Suite are productivity, management, and graphics applications. On the productivity side this includes Words (formerly KWord), Tables (formerly KSpread), Stage (formerly KPresenter), Flow (formerly Kivio), and Kexi. Calligra's management application is Plan to replace KPlato and on the graphics side there is Krita and Karbon.
The announcement of this KOffice successor is found at dot.kde.org. But perhaps more interesting though is this blog post just published by Aaron Seigo that actually goes into detail on the KOffice to Calligra situation. "So, let's start with some facts: KOffice has experienced an internal fork and in the process has been renamed "Calligra". The fork itself came about through unresolved differences between a member of the KOffice team and the rest of the members over how to manage both long term targets and day-to-day development. This eventually resulted in people coming to the conclusion that those differences were not only unresolved but also unresolvable. To call a one person schism a fork may seem a bit overly dramatic, but that's certainly how it felt to those involved and was not a triviality. Coming to a fork, the rest of the KOffice team took the opportunity of change to rethink various aspects, including the name."
Aaron thought also sheds some light onto Calligra's possible future within KDE:
Done right, Calligra could become another WebKit, but for documents rather than HTML. It has many of the same characteristics KHTML did back in the day: it's light weight, it's got a number of compelling features, it's flexible and easy to hack on relative to what else is out there and it has the start of commercial adoption.
To really get the most out of Calligra, it would be a tremendous bonus for me to be able to use apps with the same behind-the-scenes engine on my desktop, tablet and smartphone.
At least Calligra is a more original name and better than LibreOffice, which was conceived after many community OpenOffice.org developers decided to dissent from Oracle's OpenOffice.org project.